I know Mr Brown； we ＿＿＿＿＿＿ to each other at an international conference.
| A．are introduced | B．have been introduced |
| C．were introduced | D．had been introduced |
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I know Mr Brown； we ＿＿＿＿＿＿ to each other at an international conference.
| A．are introduced | B．have been introduced |
| C．were introduced | D．had been introduced |
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