单项选择题

— You should have thanked her before you left.
— I meant （）, but when I was leaving I couldn’t find her anywhere.

A. to do
B. to
C. doing
D. doing so

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单项选择题
He made another wonderful discovery, （）of great importance to science.

A. which I think is
B. which I think it is
C. which I think it
D. I think is
单项选择题
His fellow workers saw him fall down and blood came out from the open （）

A. wound
B. injury
C. hurt
D. damage
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