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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单项选择题

He'll never succeed in passing the CET-4, （） hard he tries.

A．whatever
B．despite
C．though
D．however

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