问题
选择题
They ________ often _______to be careful before _______the road.
A．are, told, cross
B．are, told, across
C．are, telling, crossing
D．are, told; crossing
答案
答案：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。
