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问题: 英语

1.In many countries people can buy things ___installments
2.This is the____(helpful)servant we have ever
employed.
3.My elder sister is flur years ___(old) than I

解答:

on;most helpful;older
说明:
1.例句:If you can't pay for the house in cash, you can buy it on installment.
如果你不能用现金购房, 也可以分期付款。
2.凡是以ful结尾的形容词,其比较、最高级都是more...3.elder只作定语,这里不适用