题目内容
(2013·成都第二次诊断)—Where did you get this book?
—I picked it up from a secondhand bookshop if you ________ know.
—I picked it up from a secondhand bookshop if you ________ know.
| A.must | B.will |
| C.can | D.shall |
A
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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