单项选择题

—Is Prof. Tate very sick
—I'm afraid______.

A．so
B．this
C．that
D．to
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单项选择题
I bought a pair of shoes______.
A．at the half price
B．half at the price
C．at half the price
D．the half at price
单项选择题
This reference book______again.
A．is worth to read
B．is worthy reading
C．is worth being read
D．is worth reading
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