单项选择题

_____, it looked simple. But, in fact, it was rather complicated.

A．Firstly
B．At first sight
C．To begin with
D．From the beginning
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单项选择题
It was not a grand occasion, so we were allowed to wear _____ clothes.
A．formal
B．causal
C．simple
D．plain
单项选择题
The company has promised to _____ no efforts on the cooperation with us.
A．spare
B．save
C．share
D．make
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