单项选择题

(Such ) crimes (may be) (too) complex (that) months or years go by before anyone discovers them.

A．Such
B．may be
C．too
D．that
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单项选择题
(That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages.
A．That
B．but
C．is
D．was
单项选择题
The new instrument is (far) superior (than) the old (one) we bought three years (ago).
A．far
B．than
C．one
D．ago
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