单项选择题

I would have come sooner but I ______ that you were waiting.

A．wouldn' t know
B．didn' t know
C．haven' t known
D．don' t know
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单项选择题
Volcanoes (火山) ______ as active, dormant and extinct.
A．described
B．are described
C．being
D．which are described
单项选择题
The children won' t go there to watch the iron tower ______.
A．to erect
B．to be erected
C．erecting
D．being erected
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