The twins look the same. Mr Li find ______ hard to tell one from the other.
A it           B them     C her     D that
：A
：考查it作為先生賓語用法。英語中只有it可以作為形式主語，形式賓語。本句的it是形式賓語，真正的賓語是不定式to tell one from the other.故A正確。
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