单项选择题

While building a highway across the desert, ______

A．an underground town was discovered
B．there was an underground town discovered
C．the workers discovered an underground town
D．a town was discovered underground
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单项选择题
It's nearly 4 hours' drive from here, ______ we have to start very early if we want to get back before dark.
A．meaning
B．considering
C．thinking
D．saying
单项选择题
In 1901, H.G. Wells, an English writer, wrote a book ______ a trip to the moon.
A．describe
B．described
C．describing
D．to describe
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