单项选择题

He has made another discovery, ______ of great importance to science.

A．which I think it is
B．of which I think it is
C．which I think is
D．I think which is
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单项选择题
--What about having a rest--______.
A．Good idea
B．Help yourself
C．Go ahead, please
D．Me, too
单项选择题
From his ______ eyes, we can see that he is ______. [A] puzzling; puzzled [C] puzzling; puzzling [B] puzzled; puzzling [D] puzzled; puzzled
A．From his ______ eyes, we can see that he is ______.
B．puzzling; puzzled
C．puzzled; puzzling
D．puzzling; puzzling
E．puzzled; puzzled
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