单项选择题

They ______ so tired if they ______ for a whole day.

A．wouldn't feel, didn't walk
B．wouldn't feel, weren't walking
C．wouldn't be feeling, weren't walking
D．wouldn't be feeling, hadn't been walking
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单项选择题
Maggie tiptoed over and took the clock away because she hated to hear it ______ when she was trying to go to sleep.
A．sounding
B．humming
C．ticking
D．ringing
单项选择题
The ______ crown jewels are kept in the Tower of London.
A．valued
B．valueless
C．invaluable
D．usable
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