问题: 选什么? 为什么?
. Tom has been writing letters all afternoon, but he should have finished them by now,
______?
a. hasn’t he b. has he c. shouldn’t he d. didn’t you
解答:
Tom has been writing letters all afternoon, but he should have finished them by now, ___C___?
a. hasn’t he b. has he c. shouldn’t he d. didn’t you
这一句比你后面提的问题简单多了,简单的前否后肯前肯后否啊,根据就近原则对he should have finished进行反义疑问. 疑问成分里面肯定有should not,所以排除其他所有选项.
参考文献：calendula28
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