During the mourning period（悼念期）flags are _________

试题详情及答案解析

During the mourning period（悼念期）flags are __________at half-mast, all public amusement will be stopped.

A．be kept	B．to be kept
C．kept	D．keep

答案：B

试题分析：句意：在哀悼期间降半旗，公共娱乐将停止。Flags是keep这一动作的承受者该用被动语态，所以选B。
考点：考查非谓语动词。