单项选择题

These questions ______ in English.

A．must answer
B．should answer
C．must be answered
C．can answer
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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
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
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