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题目
选择一个连词:I did not buy the watch yesterday( ) my mom would give me one.
I did not buy the watch yesterday( ) my mom would give me one.
until? because? if? before?
我在想选第二个还是第三个呢

提问时间:2020-11-20

答案
because
如果用if的话,前面的分句应该用现在时
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