易错题、难题、好题档案
5. _____ the fact that his initial(开始的)experiments had failed, pro. white persisted (坚持) in his research.
a. because of b. as to c. in spite of d. in views of
6. the millions of calculations(计算) involved, had they been don't by hand, _____ all practical value by the time they were finished.
a. could lose b. would have lost c. might lose d. ought to have lost
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