unit17laughterperiodthreegrammar課時精練北師大版選修6，課標(biāo)通用-wenkub.com
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【正文】 根據(jù) over the past five hours 可知用現(xiàn)在完成進(jìn)行時，表示動作開始于過去，一直持續(xù)到現(xiàn)在，且現(xiàn)在還在進(jìn)行。根據(jù)時態(tài)一致的原則，可排除 B、 D兩項；由 she did not know how long...可知應(yīng)用過去完成進(jìn)行時，表示持續(xù)發(fā)生的動作。 ] 12． I had to write to Becky again because I________a reply. A． hadn’t received B． wasn’t receiving C． don’t receive D． hasn’t received 答案 A [截止到我得再次寫那個時候還沒有收到用 hadn’t received。 ] 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。 ] 4． After 15 miles she suddenly real
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