单项选择题

The children went there to watch the iron tower ______ .

A．to build
B．building
C．be built
D．being built
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单项选择题
The students was just about to ______ the question, when suddenly he found the answer.
A．arrive at
B．submit to
C．work out
D．give up
单项选择题
We grow all our own fruit and vegetables, ______ saves money, of course
A．what
B．which
C．as
D．that
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