单项选择题

It's nearly seven o'clock. Jack ______ be back home at this moment.

A．must
B．could
C．can
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单项选择题
—Where's Mary now Do you know— No, but I heard ______ in her room a few minutes ago.
A．her singing
B．her sing
C．she was singing
单项选择题
— How much ______ the shoes—Five dollars ______ enough.
A．are;is
B．is;are
C．is;is
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