That helps to explain ( ). businesses are setting up Net sites even though profits aren't yet very big.

题库:报检员 类型:最佳选择题 时间:2017-07-03 10:56:37 免费下载:《单项选择》Word试卷

That helps to explain ( ). businesses are setting up Net sites even though profits aren't yet very big.
A.that
B.the reason for
C.why
D.why that

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