(2013·浙江高考)Eye doctors recommend that a child's first eye exam ________ at the age of six months old.
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A
was
B
be
C
were
D
is
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 Michael ______ be a policeman, for he is much too short.
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A
needn’t
B
can’t
C
should
D
may
 I insisted that a doctor        immediately.
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A
has been sent for
B
sends for
C
will be sent for
D
be sent for
 I request that you __________ the task on time.
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A
finished
B
should finish
C
could finish
D
would finish