单项选择题

After ______ seemed an endless wait, it was her turn to stop into the doctor's office.

A．it
B．that
C．what
D．which
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单项选择题
The book will show the readers ______ can be used in other contexts.
A．that how have they observed
B．how that they have observed
C．that they have observed
D．how what they have observed
单项选择题
His manner was so pleasant that Bolla felt at ______ with him at once.
A．peace
B．large
C．ease
D．best
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