单项选择题

A．until
B．once
C．after
D．since
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单项选择题
A．magnifiesB．intervenesC．containsD．maintains
A．magnifies
B．intervenes
C．contains
D．maintains
单项选择题
A．She grades papers very quickly.B．She isn’t teaching this semester.C．She didn’t require any papers last semester.D．She was more flexible last semester.
A．She grades papers very quickly.
B．She isn’t teaching this semester.
C．She didn’t require any papers last semester.
D．She was more flexible last semester.
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