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填空、翻译并解释选项Is Russia____Eruopean country or___Asian one?A a;a

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填空、翻译并解释选项
Is Russia____Eruopean country or___Asian one?
A a;an B an;an
John was so sleepy that he could hardly keep his eyes___.
A open B to be opened C to open D opening
The students are ___young people between the ages of sixteen and twenty.
A most B much C mostly D at most
"Excuse me,is this Mr.Robinson's office?""i'm sorry,but Mr.Robinson___works here.He left about three weeks ago"
A not now B not more C not still D no longer
请填空、翻译,并解释为何选择
1.A European开头是辅音/j/,所以用a,而Asian第一个音是/ei/元音,用an.
2.A keep +名词+形容词——保持,状态.
3.C mostly大部分;most最多;at most:至多,最多.
4.D no longer:再也不,/不再,;其他选项都有否定词not,但同时缺乏助动词does,所以不能选.