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问题: 如何以语法的角度解释这道题

____you lose confidence, you won't be able to do the work well.
A.When B.And C.Because D.If
我自己感觉A和D之间比较犹豫。请老师们帮助

解答:

_If___you lose confidence, you won't be able to do the work well.
D.If
if...will/won't 固定搭配
if 表虚拟,后面采用将来时

如果是A.When ,则句子应该这样:
_When___you lose confidence, you are not able to/can't do the work well