问题
It’s clever _____ you to help me work out this difficultmaths problem. Thanks.— You are welcome. Now it’s easier ______ you tounderstand it.
A: of;of
B: of; for
C:for;of
D: for; for
B: of; for
C:for;of
D: for; for
正确答案是：
同类题型
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So we think it is reasonable to assume that they lived in these caves, the cold.[ ]
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