It’s the gases ___ natural gas and the burning of coal give off ____ add to the
题型：不详难度：来源：
It’s the gases ___ natural gas and the burning of coal give off ____ add to the overheating of the earth.| A．that; what | B．that; that | C．which; which | D．that; which |
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答案
| B |
解析
| 考查从句。第一个为定语从句，且先行词在定语从句中充当宾语，故用that或which；第二格是强调句的后半句，故用that。意为：是天然气和煤放出的气体增加了地球的过热。 |
举一反三
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