古镇周庄是典型的江南水乡，镇中多数小桥为拱型设计（下图），据此推断该镇当时

A．多洪涝灾害

B．船为主要交通工具

C．建桥材料丰富

D．濒临海洋

Andy was crying in his room just now，but he wouldn’t tell me_______ made him so sad.

A．why it was that

B．why was it that

C．what it was that

D．what was it that