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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