It is important to know about the cultural differences that______ cause problems．
A．mustB．mayC．dareD．shall
B

試題分析：考查情態(tài)動詞辨析。Must必須；may也許；dare敢于；shall表示命令，允諾，要求；句意：了解那些也許導(dǎo)致問題的文化差異很重要。根據(jù)句意說明B正確。
點評：Must必須；may也許；dare敢于；shall表示命令，允諾，要求；同時要注意一些情態(tài)動詞的特殊用法。
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