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I was doing my homework while my parents were ________ (cook)dinner.
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某多肽的化学式为C53H66O19N10,将它彻底水解得到三种氨基酸:甘氨酸(C2H5NO2),苯丙氨酸(C9H11NO2),谷氨酸(C5H9NO4)则此多肽中有肽键数为
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After John had been in London for three years, he and his wife had a lot to tell ________.
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