Don't try to do all at once;take one ____a time.A at Bon Cin Dfor

Don't try to do all at once;take one ____a time.A at Bon Cin Dfor
Don't try to do all at once;take one ____a time.A at Bon Cin Dfor

Don't try to do all at once;take one ____a time.A at Bon Cin Dfor
Don't try to do all at once;take one at a time.
at a time是"每次"的意思
in a time是"一段时间后"的意思
on a time是"在一段时间里"的意思
for a time是"一段时间"的意思

at a time
别一次弄完。
一次弄1个

in不要什么都全部做完，一次做一件。

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不明白的再问哟，请及时采纳，多谢！