2. 外语
  3. A number of theories have been proposed to explain the situation.

A number of theories have been proposed to explain the situation.

admin2011-04-14  39
问题 A number of theories have been proposed to explain the situation.
选项 A、suggested
B、tested
C、used
D、announced
答案A
解析 本题难度不大，干扰项干扰性不大，propose和suggest都有“建议”的意思，最佳答案是A。
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