5.Ever since he fell ill,Peter ________ a fever day and night,worried that he's been infected with the Ebola virus.(  )
A.suffered fromB.has suffered from
C.suffers fromD.were suffering from

分析 自從生病,彼得就日夜發(fā)燒,擔(dān)心自己感染了埃博拉病毒.

解答 答案是B.本題考查現(xiàn)在完成時(shí);題干中的 ever since(自從)表示"自從過去某一時(shí)間起到現(xiàn)在",是現(xiàn)在完成時(shí)的標(biāo)志詞,since從句中用過去時(shí),主句中必須用現(xiàn)在完成時(shí);故選B.

點(diǎn)評(píng) 對(duì)時(shí)態(tài)的選擇,要在把握時(shí)態(tài)的基本用法的基礎(chǔ)上,根據(jù)具體語境和題干中的時(shí)間推斷時(shí)態(tài),同時(shí)關(guān)注特殊的結(jié)構(gòu).

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