题目内容
【题目】—Shall Tom go and play football?
—Not unless he ______ his homework.
A. has finished B. finished
C. is to finish D. would finish
【答案】A
【解析】考查动词的时态。在unless引导的条件状语从句中,用现在完成时代替将来完成时。句意:——汤姆可以去踢足球吗?——除非他完成作业,否则不能出去。
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