Only after they had discussed the matter for a few hours a decision. A. they reached B. did they reach C. they reach D. do they reach 题目和参考答案——青夏教育精英家教网—

题目内容

Only after they had discussed the matter for a few hours ______ a decision.

A. they reached B. did they reach C. they reach D. do they reach

【答案】

【解析】

试题分析：考查倒装。Only+时间状语或从句，放句首时，主句用部分倒装，A、C没倒装，排除A、C；根据had discussed可知，空白处使用过去时，排除D。故选B。

考点：考查倒装

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Some governments have realized how serious the dangerous waste problem is and are now trying to settle this problem. They are also trying to limit the amount of waste industries are allowed to produce.

Not only governments but ordinary people as well must work together to solve the problem. They can choose not to buy those products which require the production of dangerous waste, and produce less harmful waste themselves. Many scientists think that waste production can be cut. The waste can be reduced by at least one third using existing technologies and methods.

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A．Measures of Reducing Dangerous Waste

B．Danger of Harmful Waste to Mankind

C．Dangerous Waste and Water Pollution

D．Environmental Protection

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B．do not know where to place the dangerous waste

C．are not clear about how serious the dangerouswaste problem is

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B．How to increase their production.

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D．How to cut down the related costs.

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B．Present technologies have settled the harmful waste problem.

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