if John doesn't come to work on time,he may be fired.surely he isn't so foolish( )not to realize

问题描述:

if John doesn't come to work on time,he may be fired.surely he isn't so foolish( )not to realize
that.
a:as b:that c:and d:but

a
so .as to 如此.以致于.
此处不能使用so.that 结构,因为that 后面要接从句,而此处是动词不定式to,排除b
cd不构成并列或者转折的关系
翻译:如果John不及时来工作,他可能会被开除.他肯定不会蠢到连这个都没意识到