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【单选题】
含巯基的氨基酸是A.
半胱氨酸
B.
丙氨酸
C.
亮氨酸
D.
组氨酸
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【单选题】He insisted that everything would be alright. _____, I could not help feeling anxious.
A.
Yet
B.
But
C.
Also
D.
Nevertheless
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