17．Bob would have helped us  yesterday，but he                ．（　�。�
A．was busyB．is busyC．had been busyD．will be busy

分析 句意：昨天Bob本可以幫助我們的，但是他太忙了．

解答 答案：A．根據(jù)前一句Bob would have helped us yesterday中的would have helped及yesterday說(shuō)明這是對(duì)過(guò)去情況的虛擬；but后面的句子應(yīng)該是表過(guò)去的真實(shí)情況，應(yīng)使用陳述語(yǔ)氣，故使用一般過(guò)去時(shí)，所以選A．

點(diǎn)評(píng) 本題考查虛擬語(yǔ)氣中的時(shí)態(tài)．but是個(gè)含蓄的虛擬條件句，通常but前面的句子用虛擬語(yǔ)氣，but后面的句子是真實(shí)情況，所以一定要根據(jù)上下文語(yǔ)境，注意時(shí)間狀語(yǔ)，理解句意，再來(lái)作答．

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