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
From his () eyes, we can see that he is ().

A.puzzling; puzzled
B.puzzling; puzzling
C.puzzled; puzzling
D.puzzled; puzzled
单项选择题
--Who are you going to have this letter () for you --My secretary.

A.type
B.typed
C.been typed
D.been typing
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