单项选择题

______ his work, he would do it till it was finished.

A．Once Tom would start
B．Once Tom started
C．Since Tom would start
D．Since Tom started
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单项选择题
______ that the left side of the human brain is responsible for logic.
A．It generally is believed
B．It is generally believed
C．It is believed generally
D．Generally it is believed
单项选择题
There is no point ______ it again to him, for he never listens to our advice.
A．saying
B．to say
C．say
D．said
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