单项选择题

Although Japan is now an economic giant, it has one vital weakness that it lacks the ______ material necessary for its industry.

A．original
B．primary
C．crude
D．raw
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单项选择题
Most of the new workers graduated from the vocational school ______ the skill in just one month.
A．attained
B．obtained
C．acquired
D．achieved
单项选择题
He had to drive fast yesterday; otherwise he ______ his plane.
A．would miss
B．had missed
C．would be missing
D．would have missed
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