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

試題分析：句意：這個問題是非常難的，所以我請求我的哥哥幫忙。A. but但是；    B. or或者； C. because因為；D. so所以。結(jié)合句意，前半句表示原因，因為題太難，后半句表示結(jié)果，所以我請求哥哥幫忙。故選D。
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