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
The children ______ many times not to go near the river.
A．were being told
B．have been told
C．had been told
D．told
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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