7.He _______ have finished his work; otherwise,he wouldn't be enjoying himself by the seaside.( 。
A.shouldB.mustC.needD.can

分析 他肯定已經(jīng)完成了他的工作;否則他不會再海邊逍遙自在.

解答 答案是B.本題考查"情態(tài)動詞+have done"的結(jié)構(gòu).should have done是虛擬語氣,表示"本應(yīng)做但事實上卻沒有做";must have done表示推測,表示"肯定已經(jīng)…";need have done只能用在否定句中表示"本不必做…,實際上卻做了";can have done 用在否定句和疑問句中,表示"可能已經(jīng)…嗎?"或"不可能已經(jīng)…".根據(jù)句意可知,他現(xiàn)在在海邊,故判斷他"肯定已經(jīng)"完成工作,由此判斷答案選擇B.

點評 要在正確理解情態(tài)動詞的基本含義的基礎(chǔ)上,整體理解語境中的情感態(tài)度,做出合理的判斷.

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