while （）an efficiency test on an engine ,certain precautions should be observed.a making b to make c being made d made.thanks a lot.

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while （）an efficiency test on an engine ,certain precautions should be observed.a making b to make c being made d made.thanks a lot.
while （）an efficiency test on an engine ,certain precautions should be observed.
a making b to make c being made d made
.thanks a lot.

while （）an efficiency test on an engine ,certain precautions should be observed.a making b to make c being made d made.thanks a lot.
选 A while 后面接动名词形式,表示"正在做.的时候." ,由于这里的人对于
test 来说,是主动关系 ,所以用 making 而不用 being made.
翻译:在对一台发动机做效率测试时,必须遵守一定的预防措施.

选 A while 后面接动名词形式, 表示"正在做........的时候......." , 由于这里的人对于
test 来说, 是主动关系 , 所以用 making 而不用 being made.make的主语省略了，那么它的主语不应该是后面主句的certain precautions 么？如果主语是certain precautions的话不就是被动了么，made?不理解啊...

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选 A while 后面接动名词形式, 表示"正在做........的时候......." , 由于这里的人对于
test 来说, 是主动关系 , 所以用 making 而不用 being made.

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An error occurred while processing the data While the teacher ---(have )an english lesson while（1）{ } 即 WHILE(1); I,while,was,down,the,walking,street,alien,an,of,out,got,UFO,the(连词成句） while （）an efficiency test on an engine ,certain precautions should be observed.a making b to make c being made d made.thanks a lot. 大学英语（3）,有谁会做?(一) 单选题 1. While he normally shies away from introducing resolutions, he made _________ in this case.(A) an exception (B) an example (C) an expectancy (D) an extemporization while（count-j） while(! while while(! while an error occurred while processing this directive怎么翻译? an error occurred while processing this directive什么意思? an unh and led error occurred while processing意思 an error occurred while trying to connect to the realserver an error has occurred while downloading the voice massage 安装时出现An error occurred while copying files怎莫办 While you are riding abike ,()(),()() the risk of an accident