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Bob would have helped us yesterday, but he-_______
A．was busyB．is busyC．had been busy. D．will be busy
A

試題分析：考查時(shí)態(tài)：句意：鮑勃昨天本應(yīng)該來幫助的，但是他很忙，說明他很忙是昨天的事實(shí)，是對(duì)過去事實(shí)的陳述，不需要用虛擬語氣。選A。
點(diǎn)評(píng)：考查時(shí)態(tài)時(shí)，如果有時(shí)間狀語，就充分利用時(shí)間狀語，如果沒有，要結(jié)合上下文找出來。這道題的關(guān)鍵要看清but后面的內(nèi)容是事實(shí)，不能用虛擬語氣。
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