单项选择题

While he （） the flowers it began to rain. He put up his umbrella and went on waiting.

A．watering
B．was watering
C．watered
D．had watered

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单项选择题
He ran all the way home and arrived （） breath.

A．without
B．lack of
C．beyond
D．out of
单项选择题
It was in the year 1999 （） John Smith found a way to send messages on the Internet.

A．in which
B．that
C．when
D．which
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