高等继续教育 / 专科英语I
正确率：100%
题型描述: 单选题
It is certain ＿＿＿＿＿＿ they will come here on time.
A.when
B.that
C.what
D.where
It is certain ＿＿＿＿＿＿ they will come here on time.
A.when
B.that
C.what
D.where
参考答案：
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