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问题: 英语提问

1.Parents vary greatly__their degree of strictness towards their children.
A to B in C for D with
2.The two explorers climed up the mountain,and__carried a rucksack on his shoulders.
A each B every C all D both
3.Without your timely help.our team__not have fulfilled the task so perfectly.
A should Bcould C must D will

解答:

1, B. 介词in表示在哪一方面。
2, A. 两个人当中的每一个,应为后面用的是表单一的his ,所以不能选用D。
3, B. 这里表示对过去事情的猜测、推断等。表示“不可能”。