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急~~帮忙解释一下这几道题

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急~~帮忙解释一下这几道题
1.When _____ a game of football?
A.had you last
B.did you last have
C.last had you
D.did you have last
答案是B 为什么呢?
2.Police men __ very busy
A.nearly are always B.always are nearly C.always nearly are
D.are nearly always
答案肯定是D 我不知该怎么样解释nearly要在always前面
3.It seems important that the system of competition __various field.
应该填 be introduced into 怎样解释呢?
4.He was about to sit up when he felt something move near his feet.
这里面的move为什么要改成moving.
谢谢大家了
急~~帮忙解释一下这几道题
1.last是“上一次”,是中位副词,与一般过去时连用.
2.nearly是程度副词,“几乎、将近”,修饰 always .
3.在It is important/necessary/essential后面的that 从句中,无论主语是单数还是复数,谓语都用should +动词原形,should也可以省去.本题中be introduced 前也可以加上should.
4.“feel\hear\see等感觉动词 + 宾语+ do” :do这个动作已经完成;而“feel\hear\see等感觉动词 + 宾语+ doing ”:doing 这个动作正在进行.本题中若用move 表示“移动过了”,用moving表示“正在移动”.根据句意,应该把move 改成moving.