单项选择题

Although ______ before the war, the engine is still in perfect order.

A．building
B．to build
C．built
D．Being built
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单项选择题
He moved away from his parents, and missed them ______ enjoy the exciting life in the big city.
A．too much to
B．enough to
C．very much to
D．much so as to
单项选择题
I had just started back for the house to change my clothes ______ I heard voices.
A．as
B．when
C．after
D．while
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