单项选择题

______ your opinions are worth considering, the committee finds it unwise to place too much importance on them.

A．As
B．Since
C．Provided
D．While
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单项选择题
______,heat is produced.
A．Certain chemicals are mixed together
B．That certain 'chemicals are mixed together
C．Whenever certain chemicals are mixed together
D．The mixing together of certain chemicals
单项选择题
My pain ______ apparent the moment I walked into the room for the first man I met asked sympathetically: Are you feeling all right
A．must be
B．had
C．must have been
D．had to be
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