B.is being polluted
C.has been polluted
D.have been polluted
答案:D
解析:考查时态、语态及主谓一致。名词被quantities of修饰且作主语时,其谓语动词用复数形式,故B、C两项不正确;水是被污染的,所以需要用被动语态。故答案为D,现在完成时表示过去的动作(水被污染)或行为对现在造成的结果或影响(湖水的气味难闻)。
11.A poet and artist______coming to speak to us about Chinese literature and painting tomorrow afternoon.
A.is
B.are
C.was
D.were
答案:A
解析:句子的主语a poet and artist一位诗人兼艺术家,指同一人,应用单数谓语动词,排除B、D。tomorrow afternoon表明该题选A。is coming进行时表将来。
12. ________ the houses were knocked down in the earthquake.
A.A great many
B.The number of
C.A great many of
D.A great deal of
答案:C
解析:A项“许多;大量”,其后直接接可数名词复数,当被修饰词前有限定词时,要加of;B项“……的数量”;D项“许多”,修饰不可数名词,故C项正确。
13.Three fourths of the surface of the earth ________ sea.
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