皮皮学，免费搜题
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【单选题】
下列哪种维生素缺乏会引起坏血病?A.
硫胺素
B.
核黄素
C.
硫辛酸
D.
维生素C
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【简答题】LR(1)分析法中的L表示______，R表示______，数字1表示______。
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【简答题】1八80070014大，“1”表示：______，“7”表示：______．
【单选题】Whe she was in America,she___-three foreign languages ,but she___all except a few words of each.
A.
spoke had forgotten
B.
spoke has forgotten
C.
had spoken had forgotten
D.
had spoken have forgotten
【判断题】Danielle Older liked the diverse make-up of her classes whe she studied abroad.
A.
正确
B.
错误
【单选题】It was not _____ she took off her dark glasses _____ I realized she was a famous film star. [ ]
A.
where, that
B.
until, that
C.
until, when
D.
when, then
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