填空题

__________________ (工程师设计出一种新方法)by which the production has been increased by 80 percent.

【参考答案】

The engineer worked out a new method
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The patient would die of the acute infection, __________________(除非病情得到控制)
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A．rideB．liftC．helpD．rise
A．ride
B．lift
C．help
D．rise
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