单项选择题

The mason ______ I didn't do this exercise is I didn't know how to do it.

A．why...because
B．why...that
C．for...that
D．that...because
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单项选择题
The sports meeting, originally due to be held last Friday, was finally ______ because of the bad weather.
A．set off
B．broken off
C．worn off
D．called off
单项选择题
To succeed in a scientific research project, ______.
A．one needs to be persistent
B．persistence is needed
C．one needs be a persistent person
D．persistence is what one needs
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