问题
选择题
He is a key _____ in the murder so we must protect him from all kinds of danger.[ ]
A. witch
B. watcher
C. wizard
D. witness
答案
答案：D
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He is a key _____ in the murder so we must protect him from all kinds of danger.[ ]
A. witch
B. watcher
C. wizard
D. witness
答案：D