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They ________ often _______to be careful before _______the road.
A.are, told, crossB.are, told, acrossC.are, telling, crossingD.are, told; crossing
D
D“他们经常被告诉过马路时要小心。”,根据句意得知,考查的是被动语态。before在此为介词,后加doing,故选D。
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