They urged that the library ______ open during the vacation.
#86800
A
must be kept
B
is kept
C
would be kept
D
be kept
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Mr. Liu insists that the price of petrol _____ too high and that he ____ his car.
#87446
A
is, sells
B
should be, should sell
C
is, should sell
D
should be, sells
——You didn’t wait for Mr. Black last night, did you?——No, but we ____. He didn’t return home at all.
#89422
A
couldn’t have
B
needn’t have
C
didn’t need to
D
should wait have
 He ______ the test again, in which case, his mother will be very disappointed. 
#89549
A
might fail
B
must have failed
C
should fail
D
could have failed