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问题: I didn't want to do it unless Julie ____ it ,too.

I didn't want to do it unless Julie ____ it ,too.
A.had done B.was doing
C.was done D.did
Why not choose B?

解答:

I didn't want to do it unless Julie ____ it ,too.

这里的too是:也“的意思,除非Julie也做这件事,我才愿意做这件事。表示同时发生,前后时态应一致,都用一般过去时。

选D。