单项选择题

The author points out at the beginning that______

A．every child in hospital receives some teaching
B．not enough is known about hospital teaching
C．hospital teaching is of poor quality
D．the special children's hospitals are worst off

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单项选择题

After ______ seemed an endless wait, ii was her turn to enter the personnel manager's office.

A．that
B．there
C．what
D．it

单项选择题

He's ______ as a bellyacher -- he's always complaining about something.

A．who is known
B．whom is known
C．what is known
D．which is known