unit17laughterperiodthreegrammar課時精練北師大版選修6，課標通用(編輯修改稿)
2025-01-08 12:27 本頁面
【文章內(nèi)容簡介】 Na 5 years a foreign pany then. A． had worked B． has worked C． was working D． had been working 答案 C [過去那個時候正在做某事 用過去進行時。 ] 8． — Why does the lake smell terrible? — Because large quantities of water________. A． have polluted B． is being polluted C． has been polluted D． have been polluted 答案 D [large quantities of...作主語，謂語動詞用復(fù)數(shù)形式，用現(xiàn)在完成時表示對現(xiàn)在造成的影響或后果。 ] 9． — I’m sure Andrew will win the first prize in the final. — I think it for months. A． is preparing B． was preparing C． had been preparing D． has been preparing 答案 D [截止到現(xiàn)在某個時間為止一直在進行的動作用 have been doing。 ] 10． — Have you got an
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