问题补充:
How long may I this book? For about a week.
A. borrow
B. borrowed
C. keep
D. kept
答案:
A. borrow
B. borrowed
(答案→)C. keep
D. kept
解析:how long 与延续性动词连用,而四个选项中,只有CD为延续性动词,同时在may引导的疑问句中,动词要用动词原形,故选C
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