—John, what was your sister doing while you _____ the piano?

—Oh, she _____ with toys.[ ]

A. played; played

B. played; was playing

C. were playing; played

D. were playing; was playing

( )应负责组织施工合同的全面执行。

A．承包人

B．发包人

C．施工单位

D．项目经理