问题
选择题
—Is Jack on duty today? —It ______ be him. It is his turn tomorrow.
A．mustn’t
B．won’t
C．can’t
D．needn’t
答案
答案：C
情态动词表示推测,肯定性推测用must,否定性推测要用can’t.
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—Is Jack on duty today? —It ______ be him. It is his turn tomorrow.
A．mustn’t
B．won’t
C．can’t
D．needn’t
答案：C
情态动词表示推测,肯定性推测用must,否定性推测要用can’t.