Very few people understood this contract， ______ was very obscure.
A. the language
B. the language of which
C. all it said
D. which it had said
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After months of voyage， Columbus arrived in ______ later proved to be a new continent.
A. where
B. which
C. what
D. that
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
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