一同过专四吧!(32) (03-41) Agriculture is the country’s chief source of wealth, wheat _____ by far the biggest cereal crop. A. is B. been C. be D. being Key: D 本题考的是自力主格构造。... /
2010-06-08 / 查看
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OG10语法268题及GWD22语法总结三十九 38. Scientists have observed large concentrations of heavy-metal deposits in the upper twenty centimeters of Baltic Sea sediments, which are consistent with the... /
2010-06-08 / 查看
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