单项选择题

Every field of chemistry ______ different chemical reactions.

A．holds
B．consists
C．composes
D．involves
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单项选择题
In Beijing there are many sites of historical interest ______.
A．to be visited
B．of visiting
C．to visit
D．when visiting
单项选择题
— Where is the man you talked about yesterday — Look! ______.
A．Here he comes
B．Here comes he
C．Here does he come
D．Here is he coming
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