气象爱好者孔宗明同学在x（x为正整数）天中观察到：①有7个是雨天；②有5个下午是晴天；③有6个上午是晴天；④当下午下雨时上午是晴天．则x等于（　　）

A．7

B．8

C．9

D．10

Where is it ________ you picked up this watch?

A．there

B．that

C．the place

D．which