单项选择题

I called Tom at his office, but the voice （） answered the phone was not his.

A．who
B．whom
C．which
D．when

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单项选择题

Mary got a cold so she（）stay in bed right now.

A．can
B．may
C．needs
D．could

单项选择题

（）you keep on practicing English, you can use it freely one day.

A． As long as
B．As soon as
C．As well as
D．As possible as

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