.If you ________ be quiet, I will tell you what happened. 
#88488
A
will
B
may
C
shall
D
must
推荐题目
—Any information about your son?—No. If only I ______ those tough words to him.
#90532
A
didn't say
B
hadn't said
C
shouldn't have said
D
couldn't have said
The impatient driver received a ticket for speeding. He       so fast.
#87270
A
shouldn’t have driven
B
wouldn’t have driven
C
couldn’t have driven
D
mustn’t have driven