you make sure ___________?

题目

you make sure ___________?
Can you make sure ___________?
A.that he will come here today B.when he will come here today
C.will he come here today D.whether will he come here today
A和B的区别 B中when是作主语的吗
I don’t know ___________.
A.the reason why can be B.why the reason may be
C.what the reason can be D.what the reason may be
这题看不懂 这里面can be和may be是可能的意思吗?
参考答案是A C
不是A D

答案

AC.
1.你能确定他今天能来吗?这是一个句子通顺的话语,你要确定是是今天他能不能来,就用that
2.我不知道其中可能的原因是什么?
当然用可能,就只能是can be.
maybe 表示的是也许是,肯定的猜测