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She had been waiting for Bob to break down the barrier between them.她一直在等待鲍伯去毁掉存在于他们之间的障碍.
She 主语
had been waiting for 谓语短语 过去完成进行时
Bob 宾语
to break down the barrier between them 宾语补足语
break down 打破 毁掉
wait for sb to do sth 等待某人做某事
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