I ________ him in time, otherwise he would have fallen off the bike.

A．had supported B．supported

C．have supported D．support

 

B

【解析】B　句意：我及時扶住了他，否則的話他就從自行車上摔下來了。support這個動作發(fā)生在過去，因此用一般過去時。

 

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