织发补发头有什么坏处:希望有高手来赐教!!

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我做了一题完形填空,有几个空不懂,希望高手来帮忙。
1.However, some ( ) large and spacious-forty to fifty feet in length and wtenty to thirty wide-while others of then are mere huts.
A.being B.that C.since D.be

2.The entrance is made either at one end or side, ( 1 )is an egg-shaped hole, so low that one must ( 2 )down on one's hands and knees ( 3 ) creep in.
1.A.and B.that C.but D.where
2.A.come B.get C.going D.act
3.A.for B.by C.come D.and
题目就是这样,希望单词没有打错掉,也希望大家能把为什么给讲清楚。
谢谢!!

1 a,这是分词做状语的独立主格结构 2 1 but 2 get 。must后应用动词原形,get down 在这里应该是俯身的意思 3 and 四肢伏地爬进去,连接两个动词,一般用to 或and;