题目内容

It’s the gases ___ natural gas and the burning of coal give off ____ add to the overheating of the earth.
A.that; whatB.that; that C.which; which D.that; which
B
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。
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