皮皮学，免费搜题
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【单选题】
蛋白质分子中下列哪个氨基酸是肽链合成后加工形成的（）。A.
羟脯氨酸
B.
色氨酸
C.
谷氨酰胺
D.
蛋氨酸
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皮皮学刷刷变学霸
举一反三
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A.
wherever
B.
whenever
C.
even if
D.
as if
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A.
ought to have given
B.
musthave given
C.
might havegiven
D.
need have given
【单选题】Mr. Jones woke early one morning， before the sun had risen. It was a beautiful morning， _1_ he went to the window and looked out. He was _2_ to see a neatly-dressed and mid-aged professor， who _3_ in ...
A.
because
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C.
so
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for
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