【Whenpeopleare____abus,theyshould___inline.A.catch,waitforB.waitingfor,cutC.waitingfor,joinD.catch,c
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题目内容：
When people are ____a bus ,they should ___in line.
A.catch ,wait for
B.waiting for,cut
C.waiting for ,join
D.catch ,cut
优质解答
C
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