高等继续教育 / 电子商务英语
正确率：100%
题型描述: 单选题
It is because English is useful ＿＿＿＿＿＿ _ _ .
A.which we study hard
B.why we study it hard
C.what we study hard
D.that we study it hard
It is because English is useful ＿＿＿＿＿＿ _ _ .
A.which we study hard
B.why we study it hard
C.what we study hard
D.that we study it hard
参考答案：