After months of voyage, Columbus arrived in ______ later proved to be a new continent.
A. where
B. which
C. what
D. that
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Never before _______ so rapidly developing as it is today.
A. has our country been
B. our country has been
C. has been our country
D. our country hasn‘t been
Look at this group of people ______ beach volleyball.
A. played
B. is played
C. playing
D. is playing
While _____ the book, he nodded from time to time.
A. reading
B. read
C. is reading
D. is read
He would have given you more help, if he ________ so busy.
A. have not been
B. had not been
C. not have been
D. not had been