单项选择题

Foolish ______ she is, she will not make the same mistakes twice.

A．if
B．with
C．of
D．as
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单项选择题
The machine ______, the next step was how to operate it.
A．having been installed
B．had been installed
C．having being installed
D．has been installed
问答题
Outline:1自然灾害频繁发生，给人类带来了巨大的损失。2在自然灾害面前，我们该怎么做Words for reference:development, harm, blind, earthquake, drought, harmoniousNatural Disasters
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