单项选择题

We've, under extremely difficult conditions, done very well, ______.

A．to consider all things
B．considering all things
C．all things were considered
D．all things considered
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单项选择题
I am used ______ by air and only on one occasion have I ever felt frightened.
A．to travel
B．to traveling
C．traveling
D．to have traveled
单项选择题
The two brothers are very ______.
A．alike
B．the same
C．similarly
D．likely
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