单项选择(每题1分)In his letter was his promise _____ he would spend the Christmas Eve with me.
#70344
A
that
B
what
C
which
D
whether
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It was quite a serious accident, ________caused by careless driving.
#74253
A
which I think was
B
I think which was
C
which I think it was
D
I think which it was
 These shoes look very good. I wonder _______. 
#72184
A
how much cost they are
B
how much do they cost
C
how much they cost
D
how much are they cost