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A number of sheep ___ seen by us when we passed the field

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A number of sheep ___ seen by us when we passed the field
A is B are C was D were
答案为D为什么类?
She thinks she can get there on time,___ she?
A can B doesn't C can't D does
答案为C为什么类?
第一题:sheep跟people一样,单数跟复数形式相同,且a number of表示“许多”,所以用复数are/were;其次后面是被动语态by,故选 D
第二题:反意疑问句,首先排除A、D.一般不是对think提出反意疑问,而是对后面的can,对能不能提出疑问,故选can't.