Question

See the flags on top of the building? That was &nbsp...

See the flags on top of the building? That was we did this morning. A．when B．which C．where D．what

Answer 1

答：选d
解析：后面的动词did是及物动词，因此此处所填表语从句的引导词要作其宾语，表示“……事情”。而when和where只能在表语从句中作状语，因此可以排除a,
c；which意为“哪一个”，不符合题意。故该题正确答案唯有d项。