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1,IS正确的:the rescuers reached the (skiers and found them appa

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1,IS
正确的:the rescuers reached the (skiers and found them apparently unharmed but nevertheless took them) to the hospital for observation
为什么不是(skiers,who were found apparently unharmed,neverthless taking them)
2,IS
Sime scientists believe that mentally stimulating activities may increase the number of brain cells available to replace (any that) are lost through aging.
为什么不是(if any)
3,IE
in 1988 a Soviet icebreaking ship (helped free) three gray whales that (had become trapped) in the Arctic ice after they (had swam) into the costal waters of Alaska (to feed).
为什么had swam错了?
第一题 从语法角度来说你选的who那个没错 但是从句子意思来说的话是 救援人员到了滑雪者并发现他们没受伤 而不是救援人员到了那些发现他们没受伤的滑雪者 特别是后面的taking 明显是救援人员take滑雪者
第二题 replace 是及物动词 后面要有一个 宾语 any 是宾语 that 是定语从句修饰any 但是if any 是从句了 后面没了宾语
第三题 after 后面应该是过去式 不应该是过去完成