is surprising to us is that Tom, for English was once boring, can speak English fluently

is surprising to us is that Tom, for English was once boring, can speak English fluently as though he were a native speaker.
A. As; whom
B. What; whose
C. It; whose
D. What; whom

A. As; whomB. What; whoseC. It; whose(答案→)D. What; whom解析：句意：令我们吃惊的是，汤姆的英语曾是那么令人讨厌，他现在说的英语特别流利就像讲母语一样。这里第一空是what引导的主语从句，它在从句中作主语；第二空是whom引导的定语从句，先行词是Tom，因为关系词放在介词之后所以应该用宾格的whom。故选D。

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