高等继续教育 / 专科英语II
正确率：100%
题型描述: 单选题
We have learned ＿＿＿＿＿＿＿ the rocks on the moon are 3,500 million years old.
A.how
B.that
C.what
D.which
We have learned ＿＿＿＿＿＿＿ the rocks on the moon are 3,500 million years old.
A.how
B.that
C.what
D.which
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