问题补充：
Guess what! I came across my primary school science teacher this morning, I have lost touch for almost 20 years.
A. of which
B. when
C. with whom
D. who
答案：
A. of which
B. when
(答案→)C. with whom
D. who
解析：句意：你猜怎么了，我今天早上遇到了小学科学老师，我和他没有联系了。这里是定语从句，先行词是my primary school science teacher，定语从句中使用了词组lose touch with sb.所以缺少介词with和关系代词whom，所以选C。
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