A-A+
A number of theories have been proposed to exp
问题详情
A number of theories have been proposed to explain the situation
A．suggested
B．tested
C．used
D．announced请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：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。
考点：
