C.being polluted
D.having polluted
答案:C 考查keep...from...用法。处在介词之后且含有被动意味,故用v.ing的被动式。
10.(2011·宁波模拟)________in gardening and volunteering work, Mrs. Black leads a busy and rich life at her old age.
A.Employing
B.Employed
C.To employ
D.Being employed
答案:B 考查非谓语动词。由be employed in“忙于”可知,选B项。
11.The photo brought me back to the memory of the time in Qingdao,________I spent my summer holiday by the seaside with my friends.
A.that
B.when
C.which
D.what
答案:B 考查定语从句。I spent my summer holiday by the seaside with my friends是从句部分,该部分主干成分完整,因此用关系副词;先行词是time,故选when。
12.It is reported that 1.4 million people took part in________postgraduate entrance exam,________13 percent increase from last year.
A.a; the
B.the; a
C.a; /
D./; a
答案:B 题干中的postgraduate entrance exam在这儿是特指“今年的”研究生入学考试;a 13 percent increase from last year表示比去年增加了13%,其中不定冠词a修饰后面的increase。
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