单项选择题

The word "undermine" (Para. 2) most probably means ______.

A．go below
B．weaken
C．effect
D．destroy
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单项选择题
A．findB．feelC．dropD．fall
A．find
B．feel
C．drop
D．fall
单项选择题
A．variesB．differsC．altersD．contrasts
A．varies
B．differs
C．alters
D．contrasts
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