单项选择题

The subject of these lectures ______ by the lecture committee.

A．announces
B．have been announced
C．announced
D．has been announced
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单项选择题
下列选项中不属于教学活动类型的是______。
A．调查和采访活动
B．规划文章结构
C．即兴发言与讨论
D．合作学习活动
单项选择题
There was nothing that they could do ______.
A．but wait
B．except waiting
C．only to wait
D．unless they wait
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