单项选择题

I had been working a couple of months ______ I had a letter from Mike.

A．when
B．until
C．that
D．while
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单项选择题
A．He took off his shoes.B．He watched the little boy carefully.C．He saved the little boy successfully.
A．He took off his shoes.
B．He watched the little boy carefully.
C．He saved the little boy successfully.
单项选择题
A．No one.B．The woman.C．The boy’s parents.
A．No one.
B．The woman.
C．The boy’s parents.
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