Bob would have helped us yesterday, but he ____________.
A．is busyB．had been busyC．has been busyD．was busy
：Ｄ
：考查虛擬語氣中的時態(tài)。根據(jù)前一句Bob would have helped us yesterday中的yesterday說明這是對過去情況的虛擬。But后面的句子使用陳述語氣，故使用過去時。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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