单选题 It ______ by the end of last year ______ the new student dormitory building had been completed.
A. was … which B. was … that
C. had been … which D. had been … that

【正确答案】 B
【答案解析】显然本题为一强调句，强调的是时间状语从句…因此，首先排除A和C。因为强调状语时，不能用其他词代替that。强调结构中be动词只有两个形式：is和was，如强调现在的情况，be为is；如强调过去的情况，be用was，因此，排除D，得出B为正确选择。