—Listen! Is that Kate singing in the room?

—No. It _____ be Kate. She hasn't been back from Beijing yet. [ ]

A. must

B. can't

C. mustn't

手指精细活动作业训练选用()
肘屈伸作业训练选用()
髋膝伸屈作业训练选用()
前臂旋前旋后的作业活动选用()
增强社会交往的作业训练选用()

A．拧水龙头

B．上下楼

C．排球

D．编织

E．磨沙板