单项选择题

Every director needs an assistant that he can () to take care of problems that may occur in his absence.

A. count on
B. count for
C. count down
D. count out

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单项选择题
Susan wants to know whether the measures have been agreed().

A. to
B. with
C. over
D. upon
单项选择题
Which of the following helped to preserve Lindow Man ().

A. Ice and low temperature.
B. Bacteria and oxygen.
C. Soil and energy.
D. Acid and water.
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