问题: 英语作业帮助
＿,she would have been a developed country already．
A．if china was a member of wto 20years ago
B．if china were a member of wto 20yeas ago
C.Had china been a member of wto 20yeas ago
D.If only china were a member of wto 20years ago
请给出详细解释 和选项的句型
解答:
答案是B，主句would+have+过去分词（been）表示与过去相反，故从句应该用过去完成时，即If China had been a member of WTO 20yeas ago，在虚拟语气中，省略If时，助动词had要前移至句首，即Had china been a member of wto 20yeas ago，故答案为B。
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