Bob would have helped us yesterday, but he ____________.
A．is busyB．had been busyC．has been busyD．was busy
：Ｄ
：考查虛擬語(yǔ)氣中的時(shí)態(tài)。根據(jù)前一句Bob would have helped us yesterday中的yesterday說(shuō)明這是對(duì)過(guò)去情況的虛擬。But后面的句子使用陳述語(yǔ)氣，故使用過(guò)去時(shí)。句意：昨天Bob本可以幫助我們的，但是他太忙了。故D正確。
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