作业帮要解释Don't download anything unless you make sure ______.Don't download anything unless you make sure ______.[ ]A.where it is fromB.where it would be from C.where is it from D.where had it been from
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![要解释Don't download anything unless you make sure ______.Don't download anything unless you make sure ______.[ ]A.where it is fromB.where it would be from C.where is it from D.where had it been from](/uploads/image/z/11244101-5-1.jpg?t=%E8%A6%81%E8%A7%A3%E9%87%8ADon%27t+download+anything+unless+you+make+sure+______.Don%27t+download+anything+unless+you+make+sure+______.%5B+%5DA.where+it+is+fromB.where+it+would+be+from+C.where+is+it+from+D.where+had+it+been+from)
要解释Don't download anything unless you make sure ______.Don't download anything unless you make sure ______.[ ]A.where it is fromB.where it would be from C.where is it from D.where had it been from
要解释Don't download anything unless you make sure ______.
Don't download anything unless you make sure ______.
[ ]
A.where it is from
B.where it would be from
C.where is it from
D.where had it been from
要解释Don't download anything unless you make sure ______.Don't download anything unless you make sure ______.[ ]A.where it is fromB.where it would be from C.where is it from D.where had it been from
Don't download anything unless you make sure （A.where it is from）.
不要下载任何东西,除非你确认了它的来源.
这里要选一项作为make sure的宾语从句.这种从句的特点是要使用陈述语序,即主语要放在动词之前.另一个特点是时态要和主句的一致,这里要用现在时.
错误选项的分析：
B.where it would be from：时态不对,是过去将来时.
C.where is it from：语序不对,应该是it is.
D.where had it been from：语序不对,时态也不对.
A. where it is from
原句中unless 引导一个条件状语从句，其中的make sure后面是where引导的宾语从句，从句应该用陈述语序。所以必须选A
选A.
C, D语序不对。
B时态不一致。
A. where it is from
A
unless后面跟从句，从句语序位陈述语序。
where it is from
由unless 引导一个条件状语从句，表示除非发生的情况。除非弄清楚它来来自于哪里，否则不要生下载。make sure后面是where引导的宾语从句，作为从句，where提前作为引导词，后面要求用陈述语序,it is from (where提前).