The gas must have been used up, the fire went out itself． [ ] A． because B． as C． since D． for 题目和参考答案——青夏教育精英家教网—

题目内容

The gas must have been used up, ________ the fire went out itself．

[　　]

A．

because

B．

C．

since

D．

for

答案：D

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