It is required in our school that lights in students’ rooms ______ off by 11o’clock.
#87254
A
be switched
B
would switch
C
should switch
D
must be switched
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Your advice was a great help to us, without which all our efforts       .
#87386
A
wouldn’t pay off
B
hadn’t paid off
C
wouldn’t have paid off
D
didn’t pay off
--- I didn’t go to class last night because my car broke down.  --- You _______ mine. I wasn’t using it. 
#87741
A
could borrow
B
may borrow
C
could have borrowed
D
may have borrowed