单项选择题

When a machine is ______ , suitable material must be chosen for its parts.

A．building
B．build
C．to build
D．to be built
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单项选择题
In the ______ half of the 18th century those cities became even more prosperous.
A．latter
B．latest
C．later
D．late
单项选择题
Scientists are trying to make ______ investigation.
A．further
B．farther
C．furthest
D．farthest
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