题目内容

—Shall Tom go and play football?

—Not ______ he has finished his homework.

[　　]

A．when

B．if

C．unless

D．once
答案：C
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---Not unless he ________ his homework.
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--- Not ________ he has finished his homework．

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40. —Shall Tom go and play football?
—Not ________ he has finished his homework.

A．whenB．ifC．unlessD．once