Let me think of a proper situation _____ this sentence can be used.
A. where
B. that
C. of whom
D. which
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The man _____ you are talking is in the next room.
A. to whom
B. about whom
C. about who
D. whom
This is the last factory_____ he used to work at, many workers of _____still have a good relationship with him.
A. that; it
B. which; whom
C. that; which
D. which; that
由于中医学不是建立在实验研宄基础上的，其学术理论可以说是朴素的辩证法和________的完美结合。
巴比妥类药物结构中具有1，3-二酰亚胺基团，故其（ ）
A. 呈弱酸性，能与强碱形成盐
B. 呈弱碱性，可与强酸形成盐
C. 能发生酮式烯醇式结构互变
D. 易发生解离
E. 易产生气体
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