单项选择题

Although he knew little about the large amount of work done in the field, he succeeded （） other more well-informed experimenters failed.

A. as
B. unless
C. what
D. where

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It was suggested that （） big event like the Year of Russia in China should certainly benefit （） relationship between the two countries.

A. a; the
B. the; a
C. a; /
D. the; /

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This is only one of the laundries in the district （） modem equipment.

A. that have
B. which have
C. that has
D. what has

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