企源知识库

—How much this set of furniture cost?—I forgot _____.
A、how much it costs
B、how much did it cost
C、how much it cost
D、how much does it cost
【正确答案】：C
【题目解析】：forgot引导的宾语从句，要用陈述语序；由于forgot是一般过去时，所以从句的谓语动词也要用一般过去时。