2. 外语
  3. Before taking off, the flight crew have to make sure that ______ of the passengers has fastened their seat belt and is sitting i

Before taking off, the flight crew have to make sure that ______ of the passengers has fastened their seat belt and is sitting i

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问题 Before taking off, the flight crew have to make sure that ______ of the passengers has fastened their seat belt and is sitting in an upright position.
选项 A、every
B、all
C、much
D、each
答案D
解析 这句话的意思是说，起飞前，机组人员必须保证每一位乘客都已系好安全带并端坐在座位上。(A)every每一个、每一位，强调整体，谓语动词用第三人称单数，但其后不接of；(B)all全部，所有，强调整体，谓语动词应为复数；(C)much许多，修饰不可数名词；(D)each每一个、每一位，强调部分，谓语动词为单数形式，可跟介词of。
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