English is a language that many people around the world _______not speak perfectly but _________at least understand．
#76602
A
may，can
B
would，might
C
can，must
D
should，can
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--- He worked out such different questions at a very young age.--- Oh, he ______ a very smart student then.
#63131
A
could have been
B
should have been
C
might have been
D
must have been
---- May I smoke here?---- If you , choose a seat in the smoking section
#62881
A
should
B
could
C
must
D
may
What way can you think of ______ the mice in the room?
#78055
A
how to kill
B
to kill
C
killing
D
killed