【单选题】【消耗次数：1】
As he had heart attack, he was told that he_____ continue
the work.
①
needn’ t
②
may not
③
mustn’ t
④
can’ t
参考答案：
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①
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随机题目
【单选题】
放射冠是指
①
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②
紧靠卵泡腔的一层卵泡细胞
③
紧靠透明带的一层立方形卵泡细胞
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⑤
卵泡壁最外层的卵泡细胞
【单选题】
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①
进行气体交换的场所
②
由Ⅰ型肺泡细胞和Ⅱ型肺泡细胞组成
③
相邻肺泡间的结缔组织为肺泡隔
④
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⑤
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③
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④
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⑤
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