_______  it be true that the road is being blocked at this moment, for cars are moving like snails inch by inch
#88129
A
may
B
should
C
can
D
must
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After hours of repair,the driver tried to start the car but it _______ work.
#89801
A
won.t
B
shouldn’t 
C
wouldn.t
D
couldn’t
________ your letter, I would have started off two days ago.
#87250
A
If I received
B
Should I receive
C
If I could have received
D
Had I received
It is required that no smoking ______ in the school.
#89784
A
was allowed
B
be allowed
C
would be allowed
D
had been allowed