—Where is Tom ?
—Well , he you here . Otherwise he would e down right now .
A. didn’t know ; were
B. hasn’t known ; are
C. doesn’t know ; are
D. hadn’t known ; were
网友回答
A. didn’t know ; were
B. hasn’t known ; are
(答案→)C. doesn’t know ; are
D. hadn’t known ; were
解析：本句的语义环境为：第一个人现在想见Tom，而Tom未来，是因为Tom现在还不知道第一个人在那儿。故选C。