(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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Without your help, I ____the exam last term. 
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A
failed in
B
would have failed
C
wouldn’t pass
D
would fail
If you had got up early,you   here on time.
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A
would reach
B
would have reached
C
have reached
D
had reached
 It was ordered that all the soldiers ____ to the front.
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A
should send
B
must be sent
C
be sent
D
must go