(2013·湖南长沙四校二模)—Is the letter from your mother?—Yes.But she ________the letter herself，because she doesn’t even know one word.
#62192
A
needn’t have written
B
can’t have written
C
might not have written
D
should not have written
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A hard-working man _____ become a great scientist, but a great scientist _____ be a hard-working man.
#75893
A
can’t, can
B
may not, can
C
can’t, must
D
may not, must
—How did you like the concert last night ?—I enjoyed it very much, but the dancers _____ a better job．
#63517
A
could have done
B
must have done
C
could do
D
had done
Zhanglin was lost in computer games during his last year in high school, otherwise he_______ a student at Beijing University.
#63241
A
had been
B
can be
C
has been
D
would have been
We ______ the difficulty together, but why didn't you tell me?
#63504
A
should face
B
might face
C
could have faced
D
must have faced