问题
选择题
—Where did you get The Frog written by Mo Yan?
—I picked it up from a bookshop online if you ________ know.
A．must
B．will
C．can
D．shall
答案
答案：A
A 考察情态动词，句义：如果你非要知道，我是在网店里买到的这本书。Must表示非得，偏要。
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