They have been doing their homework they came from the school． [ ] A． as B． since C． while D． because 题目和参考答案——青夏教育精英家教网—

题目内容

They have been doing their homework ________ they came from the school．

[　　]

A．

B．

since

C．

while

D．

because

答案：B
解析：

since是“自从”的意思，句意是“自从他们从学校回来后就一直在做作业”。

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