He ______busy yesterday,or he______you with your experiment.
A．was;had helped
B．was;would have helped
C．had been;would have helped
D．were;would have helped
B
該題根據(jù)交際情景考查時態(tài)的用法。第一句有明確的時間狀語yesterday，故用過去時。后一句表示過去的動作并沒有發(fā)生，故用“would have done”。
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