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SAT语法IS题________temperate zones may have a similar problem s

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SAT语法IS题
________temperate zones may have a similar problem soon
A.ALthough the global food crisis is most ovious in the tropics,the
B.Although the global food crisis had been most obvious in the tropisc,the
正选是A我选的也是A 但是想知道B是错在哪里 had been?
SAT语法IS题________temperate zones may have a similar problem s
主句是may 所以从句后退一个时态 是现在
如果主句是might 从句就是had been.
SAT里may不仅表语气还表时态的