问题

I know MrBrown；we ＿＿ to each other at an international conference

A:are introduced
B:have been introduced
C:were introduced
D:had been introduced

正确答案是：

同类题型

下列各句中，没有语病的一句是（）

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I know you have eaten all sorts of junk foodyour mother and I probably _____ you have.

Mr. Martin tried to speak so that we could understand him.

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