(2013·东北四市一模)After visiting Harbin, most of the foreign friends said they would never forget the time they had spent.
A. that
B. what
C. when
D. at which
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(答案→)A. that
B. what
C. when
D. at which
解析：选A 考查定语从句。句意：去哈尔滨游玩过之后，大多数的外国友人都说他们永远都忘不了在那里度过的时光。the time是先行词，空处在定语从句中作had spent的宾语，故选A。