He failed to do it he was too careless. [ ] A．becauseB．since C．asD．so that 题目和参考答案——青夏教育精英家教网—

题目内容

He failed to do it ________ he was too careless.

[　　]

A．because

B．since

C．as

D．so that

答案：A
提示：

because引导原因状语从句，它讲述的是直接原因，直截了当地说明因果关系。

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