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【题目】All passengers ______ go through safety check before they take a plane.
A.can
B.may
C.must
D.could

【答案】C
【解析】句意:所有乘客登机前必须接受安全检查。A. can能够,表示能力;B. may可以,表示许可;C. must必须;D. could可能,可以。登机前必须安检。故选C。

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