单项选择题

The headmaster went to Washington () the first time last September.

A．for
B．on
C．at
D．in

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单项选择题
This area of the park has been specially () for children, but accompanying adults are also welcome.

A. inaugurated
B. designated
C. entitled
D. delegated
单项选择题
I was halfway back to the hospital where the doctor was working______Susan caught up with me．
A．when
B．while
C．until
D．though
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