13l00d 发表于 2015-7-30 11:01 PM
我觉得是这样啦 希望帮到你
After we "had finished" this assignment, we learned about money market.
绿灯虾 发表于 2015-8-4 10:52 AM
had/have 后面要放 past participle - learn的pp就是learned。 Take 的PP是taken,do的pp是done。楼上的朋 ...
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