单项选择题

We should start at (once) and not waste (too) much time (to argue) (about) the procedure.

A．once
B．too
C．to argue
D．about
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单项选择题
Little children (will listen) (what) people say and (try to) imitate (what) they hear.
A．will listen
B．what
C．try to
D．what
单项选择题
The old man (will never) forget the event, (that) (has changed) his life (ever since).
A．will never
B．that
C．has changed
D．ever since
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