Since nobody gave him any help，he ________ have done the research on his own.
#62304
A
can
B
must
C
would
D
need
推荐题目
Don’t be angry with us. We _____ with you together, but we were busy with our final reports when you called in.
#62685
A
would eat out
B
could have eaten out
C
should eat out
D
must have eaten out
My sister met him at the Grand Theatre yesterday afternoon，so he ________ your lecture.
#62507
A
couldn't have attended
B
needn't have attended
C
mustn't have attended
D
shouldn't have attended
---Look at that girl! Is that Susan?---No , it _______ be her. She has gone back to her hometown.
#74215
A
mustn’t
B
can’t
C
must
D
might
Without gravity, we _____ walk on the ground as freely as we do now.
#63085
A
couldn’t
B
mustn’t
C
shan’t
D
needn’t
—I think the man over there must be Bob. -- It_______ be him. He has______ to Australia.
#78073
A
can’t, gone
B
can’t, been
C
may not, been
D
mustn’t, gone