单项选择题

It was the technician’s carelessness that _____ the accident

A．put off
B．brought in
C．led into
D．resulted in
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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
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
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