The bus ____ at six, but it arrived an hour later.
A.should arriveB.had arrived
C.should have arrivedD.must arrive
C

試題分析:考查情態(tài)動詞用法。Should have done被應(yīng)該做某事,實際上卻未做;根據(jù)下句的arrived說明本句是對過去情況的虛擬,故使用“情態(tài)動詞+have done”的形式;句意:公交車本應(yīng)該在6點到,但是卻晚來了一個小時。故C正確。
情態(tài)動詞的用法比較復(fù)雜。突出的是表示推測:如果是對現(xiàn)在的情況進行推測,使用“情態(tài)動詞+動詞原形”;對過去的情況進行推測,使用“情態(tài)動詞+have done”;情態(tài)動詞也經(jīng)常用于虛擬語氣,要分具體情況來分析,在條件句中和賓語從句,表語從句中都有體現(xiàn)。
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