21. The news has spread all over the country ________ the spaceship succeeded in returning to the earth.
A. that
B. which
C. whether
D. what
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22. You can choose ________ book you like among these.
A. no matter what
B. whatever
C. whose
D. whichever
23. Is this research center ________ we visited the modern equipment last year?
A. where
B. that
C. the one
D. which
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