If nature does not provide man with the necessary material, it is the laboratory ____ he will turn to for it．
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where
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that
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which
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what
推荐题目
We’re talking about the piano and the pianist __________ were in the concert we attended last night.
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which
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whom
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who
D
that
A book I read last year,_______name l can't remember, changed my idea about time.
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which
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that
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whose
D
what
Ellen was a painter of birds and nature, _____, for some reason, had withdrawn from all human society.
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A
which
B
who
C
where
D
whom