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 with
C.valuable
D.improving
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单项选择题
The unit of (measurement) known as foot (has) originally based on the average (size) of the human (foot).
A.measurement
B.has
C.size
D.foot
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单项选择题
The news of the air crash is not yet ______ by the government.
A.committed
B.confirmed
C.considered
D.concerned
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