So difficult __________ it to adapt to the academic requirements of a Western university that I determined to take a preparation course.

So difficult __________ it to adapt to the academic requirements of a Western university that I determined to take a preparation course.

#83316

I have felt

have I felt

did I feel

I did feel

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　　　, we would have caught the first bus.

#79909

Had we got up earlier

If we got up earlier

Should we get up earlier

Unless we had got up earlier

After a 5-year absence, we returned to our mother school, and not until then       it was such a beautiful school.

#82629

we realized

had we realized

we had realized

did we realize

(2013·江苏，27)“Never for a second，”the boy says，“________that my father would come to my rescue.”

#80075

I doubted

do I doubt

I have doubted

did I doubt

Between the two windows       was taken 10 years ago.

#79643

a picture hangs that

a picture hanging which

does a picture hang which

hangs a picture that

—I have finished the homework.—      . How about going out for a walk?

#82938

So have I

So I have

So I do

So do I

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