单项选择题

Mr. Jones, I am really pleased______ you. And I hope we will be able to see each other in not long time.

A．to meet
B．to have met
C．at meeting
D．having met
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单项选择题
There are many kinds of synthetic materials,______ plastics are the most common.
A．between which
B．of which
C．in which
D．among which
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