单项选择题

Very few scientists ________ with completely new answers to the world’’s problems.

A．come to
B．come round
C．come on
D．come up
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单项选择题
A．ConsequentlyB．HoweverC．ComparativelyD．Alternatively
A．Consequently
B．However
C．Comparatively
D．Alternatively
单项选择题
Let me ______ the broken glass before someone walks on it.
A．cover up
B．clear up
C．wash up
D．spring up
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