单项选择题

-- I think it's going to be a big problem.
-- Yes, it could be. I wonder（）we can do about it.

A. if
B. how
C. what
D. that

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单项选择题

A. shouldn't have been so careless
B. wouldn't be so careless
C. couldn't be so careless
D. mustn't be so careless

单项选择题

A. reported
B. printed
C. announced
D. published

-- I think it's going to be a big problem.-- Yes, it could be. I wonder（）we can do about it.