______theroad,don’tforgettolookbothways.
A.As crossingB.While you crossC.While crossingD.Cross在线课程C
这题考查时间状语从句的省略式,当主从句的主语一样时,可以省略从句的主语和be动词,这题的while crossing就省略了you are,句意是:当你过马路时,别忘了两边看看。选C。
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