句型转换:it happened that they were having a meeting when we arrived.——happened to——a meeting when we arrived.一个短线填一个单词!______ happened to ______ ______a meeting when we arrived.

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句型转换:it happened that they were having a meeting when we arrived.——happened to——a meeting when we arrived.一个短线填一个单词!______ happened to ______ ______a meeting when we arrived.
句型转换:it happened that they were having a meeting when we arrived.
——happened to——a meeting when we arrived.
一个短线填一个单词!
______ happened to ______ ______a meeting when we arrived.

句型转换:it happened that they were having a meeting when we arrived.——happened to——a meeting when we arrived.一个短线填一个单词!______ happened to ______ ______a meeting when we arrived.
They happened to be having a meeting when we arrived.
我们到得时候他们碰巧在开会.

___It___happened to__be___a meeting when we arrived.
这是句型sth. happen to sb. 的用法。

They happened to have a meeting when we arrived. 我们到达时碰巧他们在开会