第1题：either...or...用于两者选一,而题目中有三个可能（1.ahead 2. review an easier level 3.give more work）所以不能用either...or.
第2题：Whether...or... 可引导从句,而either...or...是并列连词,不能用来引导从句.所以只能用Whether...or... .
1：Questions and exercise are given by the computer ,which de
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