问题补充：
The manager was very angry, for he had sent his business partner two thousand machines yesterday, half of unqualified.
A. them
B. what
C. which
D. whom
答案：
(答案→)A. them
B. what
C. which
D. whom
解析：本题考查独立主格结构。句意：经理很生气，因为昨天他给他的生意伙伴寄去了2000台机器，其中一半不合格。题中的unqualified为形容词。此题容易误选C。C项前缺少谓语动词。
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