题目信息
The survival of a rare New Zealand species of mistletoe that produces spectacular sprays of scarlet flowers is threatened both because their leaves are extremely tasty to a voracious opossum species and also because their flowers are pollinated by two species of birds whose populations are in decline.
A:is threatened both because their leaves are extremely tasty to a voracious opossum species and also because their
B:is threatened both because its leaves are extremely tasty to a voracious opossum species and because its
C:is threatened both because its leaves are extremely tasty to a voracious opossum species and also its
D:are threatened both because its leaves are extremely tasty to a voracious opossum species and its
E:are threatened both because their leaves are extremely tasty to a voracious opossum species and because their
参考答案及共享解析
共享解析来源为网络权威资源、GMAT高分考生等； 如有疑问，欢迎在评论区提问与讨论
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已选答案：
正确答案：
B:is threatened both because its leaves are extremely tasty to a voracious opossum species and because its
主语是单数的，所以A/D/E都不对；
然后看B、C：
B:both because X and because Y
C: both because X and also Y
有and表明有平行，B的平行是both下两个because解释的原因平行；而C的平行是because下的平行，C要想正确，得写成because both X and also Y才可以算对。相比之下B更合理。
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题目来源
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