-Is Jack on duty today?-It ____ be him. It’s his turn tomorrow.
#87485
A
mustn’t
B
won’t
C
can’t
D
needn’t
推荐题目
So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ______.
#87593
A
ustn’t be
B
ay not be
C
an’t be
D
on’t be
Tom’s boss told Tome that if he worked hard, he _____ have a rise.
#87797
A
may
B
ought to
C
can
D
shall
He ____ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.
#89345
A
shouldn’t be
B
can’t have finished
C
can’t be
D
mustn’t have finished