解答如下:
if
[译]如果,是否
[例句]
1.She gets very upset if I exclude her from anything
要是有什么事情我不让她参加,她会非常难过。
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2.
He asked if I had left with you, and I said no
他问我是否和你一块儿离开的,我说不是。
3.
Sometimes, that standard is quite difficult, if not impossible, to achieve
有时即便有可能达到那个标准,那也是非常困难。
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