题目内容
40. —Shall Tom go and play football?
—Not ________ he has finished his homework.
A.when | B.if | C.unless | D.once |
C
解析
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题目内容
40. —Shall Tom go and play football?
—Not ________ he has finished his homework.
A.when | B.if | C.unless | D.once |
C
解析