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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