题目内容

Don’t keep silence! The head teacher is ___________a lot about that.
A.able to knowB.supposed to know
C.supposing to knowD.going to know
B

试题分析:be able to do sth能,能够做某事;be supposed to do sth应该做某事;be going to do sth打算做某事;句意:不要沉默。关于那件事,校长应该知道很多。结合语境可知选B。
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