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
Upon reaching school, ______.
A．many letters were found on the desk
B．I found many letters on the desk
C．there were many letters on the desk
D．there existed many letters on the desk
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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