单项选择题

It’s impossible for a child to do so much work within a short period of time, ______

A. isn’t it
B. is it
C. has it
D. hasn’t it
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单项选择题
Secondary and higher education______available to all high school graduates in this country so far.
A. have made

B. were made themselves
C. have been made

D. were made it
单项选择题
On hearing a great noise, Mike looked forward through the window______what happened outside the room.
A. to seeing
B. to see
C. seeing
D. to have seen
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