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【单选题】
Look around when _____ the street.A.
across
B.
crossing
C.
crossed
D.
to be crossing
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皮皮学刷刷变学霸
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【单选题】(2013·高考新课标全国卷Ⅱ)It’s an eitheror situation －we can buy a new car this year or we can go on holiday but we can’t do________.
A.
others
B.
either
C.
another
D.
both
【单选题】(2013·新课标全国卷Ⅱ)It's an eitheror situation —we can buy a new car this year or we can go on holiday but we can't do ________.
A.
others
B.
either
C.
another
D.
both
【简答题】正常成熟红细胞的形状呈 _________ _____________ ____,平均寿命____ _____________ _________。
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