单项选择题

Poor transport facilities and the lack of resources, raw materials and energy also partly ______ the drop in contract fulfillment.

A．contributed to
B．attributed to
C．depended on
D．accounted for
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单项选择题
The ship's generator broke down, and the pumps had to be operated ______ instead of mechanically.
A．manually
B．artificially
C．automatically
D．synthetically
单项选择题
The author of the report is well ______ with the problems in the hospital because he has been working there for many years.
A．informed
B．acquainted
C．enlightened
D．acknowledged
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