单项选择题

Could you tell me______ in the Russian alphabet

A．how many letters are
B．how many letters are there
C．how many there are letters
D．how many letters there are
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This new process, which is easily learned and operated, should be particularly______ to companies once put into effect.
A．advanced
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C．advantageous
D．admirable
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It's time for me to see______ dinner.
A．out
B．over
C．about
D．off
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