单项选择题

The Joneses (have visited) Hawaii and Alaska, and they (assure me) that (they) like Alaska (the best).

A．have visited
B．assure me
C．they
D．the best
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单项选择题
By next week the new regulations ______.
A．will introduce
B．are to introduce
C．are to be introduced
D．will have introduced
单项选择题
(If) the experiment succeeds or fails, it will (provide us) with valuable (experience) which is essential to (improving) our future work.
A．If
B．provide us
C．experience
D．improving
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