He _______ busy yesterday, or he _______ you with your experiment.
A．was; had helpedB．was; would have helped
C．had been; would have helpedD．were; would have helped
B

試題分析：本題實(shí)際上考察的是or(否則，要不然)引導(dǎo)的含蓄的虛擬條件句。前面句中含有yesterday這個過去時的時間狀語，故使用過去時即可。Or后面的句中要使用與過去事實(shí)相反的虛擬語氣would have done的形式。句義：昨天他很忙，要不然他就會幫助你做實(shí)驗(yàn)了。故B正確。
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