what ____hard work your mother is doing!

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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?

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)

what ____hard work your mother is doing! is,mother,your,doing,what what is your mother doing at home what is your mother doing now? What is your mother doing怎么回答 doing mother is what your 连词! Where does your mother work?work要不要加s what is your mother's tom,what's your mother doing?------------oh she is busy_____ doing mother is what your 连词成句 (1)what is your mother doing at home now? What is your mother What is your mother?