单项选择题

I ______with thanks the help of my colleagues in the preparation of this new column.

A．express
B．confess
C．verify
D．acknowledge
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单项选择题
After performing a successful operation, the doctor at last pulled the patient______.
A．back
B．in
C．up
D．through
单项选择题
The atmosphere is as much a part of the earth as ______its soil and the water of its lakes, rivers and oceans.
A．are
B．is
C．do
D．has
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