问题补充:
(·成都第二次诊断)—Where did you get this book?
—I picked it up from a secondhand bookshop if you know.
A. must
B. will
C. can
D. shall
答案:
(答案→)A. must
B. will
C. can
D. shall
解析:选A考查情态动词。if you must (do sth.)表示“如果你一定要(那么做)”,所以选A,表示“如果你一定要知道的话”。
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