[单选题]____ the high cost of air transportations, we prefer sea transportations.

A
Because
B
Because of
C
As
D
Due to
正确答案:B
题目解析
because因为,其后接句子;because of因为,其后接名词短语;as由于,其后接句子;due to只能引导形容词短语。
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