Every possible means _____ to prevent the air pollution, but the sky is still not clear.
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A
is used
B
are used
C
has been used
D
have been used
推荐题目
Only one of the answers _______ right .Either he or I________ right.
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A
are; am
B
is; am
C
are ;are
D
am; are
Between the bank and the supermarket ____________ their friend’s restaurant.
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A
is
B
are
C
has
D
have
East of our city ______ a world-famous pagoda dating from Tang Dynasty.
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A
stands
B
stand
C
stood
D
standing
Tom along with his classmates ______ for the coming exam.
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A
are preparing
B
are preparing themselves
C
is preparing him
D
is preparing himself