单项选择题

Rarely （） by so many students.

A．so much time has been wasted
B．has so much time wasted
C．has so much time been wasted
D．has wasted so much time

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单项选择题
By the time he was thirteen, Thomas （） to make a living by himself.

A．would begin
B．had begun
C．has begun
D．was begun
单项选择题
She had three daughters, all （） became nurses.

A．of which
B．of whom
C．which
D．who
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