单项选择题

If you want to get there before dark, you should start your journey （）

A．at times
B．at once
C．in person
D．in detail

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单项选择题

The play was so boring（）I could hardly keep myself from falling asleep.

A．that
B．which
C．what
D．whether

单项选择题

The unemployment rate has become much lower（）the government took these measures.

A．but
B．since
C．if
D．while

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