At the shopping centre he didn’t know what and with an empty bag.A. to buy; leaveB. to

问题补充：

At the shopping centre, he didn’t know what and with an empty bag.

A. to buy; leave

B. to be bought; left

C. to buy; left

D. was to buy; leave

答案：

A. to buy; leave

B. to be bought; left

(答案→)C. to buy; left

D. was to buy; leave

解析：“在购物中心他不知道买什么，空着包走了。”第一空疑问词+不定式作宾语，第二空和didn’t know并列作谓语，答案C。