(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research on his own.
#62474
A
can
B
must
C
would
D
need
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You ______ be hungry already—you had lunch only two hours ago!
#75956
A
wouldn’t
B
can’t
C
mustn’t
D
needn’t
The lady in this photo _______ be over fifty! She looks so young!
#74348
A
mustn’t
B
can’t
C
must
D
can
--- _______ I come back before 6 o’clock?---No，you _______．But you _______ be back later than 7 o’clock．
#76770
A
Need；must；must
B
May；mustn’t；can’t
C
Can；can’t：can’t
D
Must；needn’t；can’t
My car is covered with thick snow and now the engine simply ______ start.
#63518
A
can’t
B
mustn’t
C
won’t
D
shan’t