what ____hard work your mother is doing!

题目

what ____hard work your mother is doing!
A./ B.a C.an D.the
选B对么?为什么?
The film will begin at four o'clock,Shall we meet at ____at the gate?
A.forty past three B.half past four
C.fifty to four D.four to four
这个应该怎么选?我选的是B,可是答案给的是D为什么我不对呢?

答案

What ____hard work your mother is doing!
A./ B.a C.an D.the
只能A,这是感叹句,work是不可数名词.
The film will begin at four o'clock,Shall we meet at ____at the gate?
A.forty past three(错误的表达)
B.half past four(四点半.不合题意.)
C.fifty to four(错误的表达)
D.four to four(三点五十六分)