I ________ him in time, otherwise he would have fallen off the bike.
A．had supportedB．supported
C．have supportedD．support
B
B 考察虛擬語(yǔ)氣。句義：我及時(shí)扶住了他，要不然他就會(huì)從自行車上摔下來(lái)。根據(jù)題干中的otherwise he would have fallen off the bike可數(shù)是對(duì)過去事實(shí)進(jìn)行虛擬，所以使用一般過去時(shí)。故B正確。
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