(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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Even students of average intelligence ________ become top students by improving their study habits.
#62294
A
must
B
can
C
have to
D
ought to
In general，she is devoted to her studies，but she________be little naughty at times.
#62476
A
will
B
can
C
should
D
would
We ________ here on time but we were caught in a traffic jam.
#62326
A
must have arrived
B
could have arrived
C
need have arrived
D
should have arrived
The ground isn't wet. It ________ have rained last night.
#62681
A
mustn’t
B
shouldn’t
C
wouldn’t
D
can’t
You have a big mouth, Li Fei. You ________ have told everybody the secret.
#63222
A
can't
B
mustn't
C
shouldn't
D
mightn't