B.would not be polluted
C.had not been polluted
D.would not have been polluted
30.
a diary every day and you’ll improve your writing.
A.Keeping
B.To keep
C.Keep
D.If you keep
31.—Bob! How’s your project? I heard you started it last Friday,right?
—Oh!I
for it.But I haven’t decided when to do it.
A.have prepared
B.had prepared
C.have been preparing
D.was preparing
32.
all kinds of difficulties,the workers have made rapid progress in the construction of
the World Expo 2010 Shanghai.
A.With
B.For
C.Under
D.Beyond
33.Too high house prices can be brought under control,
the authorities introduce a series
of regulatory policies.
A.even if
B.as if
C.so that
D.provided that
34.The scientist was rewarded by the government for
such a great,contribution to the
country.
A.make
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