—There's someone knocking on the door．Who it be?—It must be Mary．She promised to be here at 8：00．
#62257
A
must
B
can
C
shall
D
need
推荐题目
Tom ____his homework yesterday, because he was in hospital all day.
#63327
A
can’t finish
B
couldn’t finish
C
couldn’t have finished
D
mustn’t finish
It is usually warm in my hometown in April, but it ________ be rather cold sometimes.
#63060
A
can
B
must
C
would
D
should
—I called you at 9 last night，but no one answered.—Sorry，I ________ sleeping.I went to bed very early.
#62284
A
need have been
B
would have been
C
must have been
D
should have been
—Look at that girl! Is it Susan?—No, it _______ be her. She has gone back to her hometown.
#77503
A
mustn’t
B
can’t
C
needn’t
D
wouldn’t