This grammar point is ___later in the afternoon class.A.to explain B.to have been explained C.to be explainedD.to be explaining这里答案应该是C,是不是将来时啊?is going to do,going能省略啊?

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This grammar point is ___later in the afternoon class.A.to explain B.to have been explained C.to be explainedD.to be explaining这里答案应该是C,是不是将来时啊?is going to do,going能省略啊?
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This grammar point is ___later in the afternoon class.A.to explain B.to have been explained C.to be explainedD.to be explaining这里答案应该是C,是不是将来时啊?is going to do,going能省略啊?
This grammar point is ___later in the afternoon class.
A.to explain B.to have been explained C.to be explained
D.to be explaining
这里答案应该是C,是不是将来时啊?is going to do,going能省略啊?

This grammar point is ___later in the afternoon class.A.to explain B.to have been explained C.to be explainedD.to be explaining这里答案应该是C,是不是将来时啊?is going to do,going能省略啊?
这句话的意思是:
在下午课的时候,语法点将被解释.
被动语态,排除A,D
而B答案,have been explained完成时,将要被解释,其实这里不需要用完成时,就用C答案的不定式表示将要就可以了.
这里不是is going to,这里是 不定式短语

be to do句型

be to do也可以表将来的
从语法方面也能分析出选C:首先语法点是被解释,所以要选被动的B/C;又由于是将来要发生的动作,所以排除B只能选C了.

C 标准答案
to be explained是被动语态 表示语言点要被稍后解释

这里是用现在时表示将来要发生的事情
be to
be to be
It is to be explained later = It will be explainted later.
这里不用 be going to