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

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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
单项选择题
He（）by his sister at that moment.

A. happened to see
B. was happened to see
C. was happened to be seen
D. happened to be seen
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