sat语法题: acquaintances of alexei have commented that he is at once annoying because of his

acquaintances of alexei have commented that he is at once annoying because of his unpredictability (but his imagination is still a delight)
a.but his imagination is still a delight
b.although he is delightfully imaginative
c.and he is delightful in his imagination too
d.while being imaginative and they are delighted
e.and delightful because of his imagination
我选的a，答案是e。首先我造选e是因为要平行结构，但是问题是1）之前说alxie很annoying，现在出现了delight，和annoying意思相反，有转折之意，不是应该用but才能更好表达意思吗？2）have commented是过去完成式，为什么that后面的谓语却是is一半现在时？2）这句话是什么意思？

谢谢！！！！！！

1）这个就是SAT语法考试和高考语法考试不同的地方了.
恰如SAT语法中我们要避免being\having等说法一样,我们要追求句式的清晰明了、整齐一致.
如果按照楼主的意思,选了A的话,这个句子毫无整齐可言；
但是如果是E的话,就会有一个“平行”的结构出现,即
annoying——delightfu
because of his——because of his
imagination——unpredictability
这就是为什么E比A要好得多.
2）因为这是一个事实，表示他现在的状态，他就是一个那样的人
3）alexei的熟人评论他的不可预测性是恼人的同时他的想象力又是令人喜爱的

同问。。。

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