Is oxygen the only gas ________ helps fire burn?A.thatB./C.whatD.it
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Is oxygen the only gas ________ helps fire burn? |
答案
A |
解析
考查定语从句。Gas为先行词,在定从________ helps fire burn中作主语,且that作主语时不可省略。所以选A。 |
举一反三
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