单项选择题

—My baby has a heart trouble.
—Did the doctor find it difficult______.

A．in treating
B．treating
C．for treating
D．to treat
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单项选择题
—Is Prof. Tate very sick —I'm afraid______.
A．so
B．this
C．that
D．to
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
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