非谓语动词
peoplealwaysshakehandswitheachotherwhen(C)eachother.AtointroduceBintroduceCintroduced...
people always shake hands with each other when ( C )each other.
A to introduce B introduce C introduced D introducing
为什么这里用C?不用A吗? 展开
A to introduce B introduce C introduced D introducing
为什么这里用C?不用A吗? 展开
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