题目内容

This question is very difficult __________ I ask my brother for help.
A．butB．or C．becauseD．so
D

试题分析：句意：这个问题是非常难的，所以我请求我的哥哥帮忙。A. but但是；    B. or或者； C. because因为；D. so所以。结合句意，前半句表示原因，因为题太难，后半句表示结果，所以我请求哥哥帮忙。故选D。
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