20. The tallest building _____ I like most is the one_____windows face the lake.
A. /; which B. /; that C. that; whose D. which; whose
19.The roof fell _____ he had time to rush out.
A.until B.before C.when D.since
18. Once _____ what to do, these computers will show great power in carrying it out.
A.to teach B.teaches C.teaching D.taught
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