——How do you find the cake?  ——This cake is very sweet. You ______ a lot of sugar in it. 
#87291
A
should put
B
could have put
C
might put
D
must have put
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It is very important that you _______ for this examination.
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A
would get yourself prepared
B
must get yourself preparing
C
should get yourself prepare
D
could get yourself prepared
 It is required in our school that lights in students’ rooms ______ off by 11o’clock.
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A
be switched
B
would switch
C
should switch
D
must be switched