He was busy with his essay at that time. Otherwise he ____ over to help us.
A.had comeB.would come
C.would have come D.was coming
C

試題分析:考查虛擬語氣。本題的關(guān)鍵詞是otherwise否則,要不然;是一個含蓄的條件句,句意:在那時候,他忙于寫論文,要不然,他會來幫我的。根據(jù)句子的at that time在那時,說明本句是與過去事實(shí)相反的虛擬語氣,故使用“情態(tài)動詞+have done”的形式。故C正確。
點(diǎn)評:條件句的虛擬語氣是考查的重點(diǎn)。如果過去事實(shí)相反,條件句中使用過去完成時,主句使用“情態(tài)動詞+have done”;如果主句與現(xiàn)在事實(shí)相反,條件句中使用過去時,be動詞使用were,主句中使用“情態(tài)動詞+動詞原形”;如果與將來事實(shí)相反,條件句中有三種:過去時;were to do ;should+動詞原形,主句使用“情態(tài)動詞+動詞原形”;要特別注意如果省略了if,句子要使用部分倒裝的形式,把助動詞,be動詞,情態(tài)動詞提之主語前。
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