单项选择题

However, as the evidence began to ______ experts from the Zoo felt obliged to investigate.

A. accumulate
B. amass
C. assemble
D. congregate
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He is quite worn out from years of hard work. He is not the man _____ he was twenty years ago.
A. which
B. that
C. who
D. whom
单项选择题
Bill is an example of a severely disabled person who has become ______ at many survival skills.
A. proficient
B. persistent
C. consistent
D. sufficient
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