单项选择题

Jane（）her boss this morning, asking for a leave, but she forgot.

A．could telephone
B．should have telephoned
C．might telephone
D．must have telephoned

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单项选择题
I missed a very good chance. I（）that work when it was offered.

A．should take
B．should have taken
C．had taken
D．took
单项选择题
She liked to stay at home. She had previously traveled seldom and then only （）

A．When necessary
B．what possible
C．which necessary
D．while possible
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