单项选择题

If you have really been studying English for so long, it's about time you__________able to write letters in English.

A．should be
B．were
C．must be
D．are
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单项选择题
Fat cannot change into muscle__________muscle changes into fat.
A．any more than
B．no more than
C．no less than
D．much more than
单项选择题
There ought to be less anxiety over the perceived risk of mountain climbing than__________ in the public mind today.
A．exists
B．exist
C．existing
D．to exist
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