单项选择题

--How is John's fever
--Nothing serious,（）it gets worse, we'll send for a doctor.

A．After
B．Unless
C．Until
D．If

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单项选择题
Since Helen is angry, we had better（）

A．leave her alone
B．leaving her alone
C．left her alone
D．to leave her alone
单项选择题
The air has leaked out of this football. Could you get it（）

A．blow
B．blowing
C．blown
D．to blow
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