It was opportunity to miss. A. too good anB. a too goodC. too a goodD. too good

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(答案→)A. too good an
B. a too good
C. too a good
D. too good
解析：句意“这是一个太好的机会，以至于不能错过。”too...to句型中的too是副词，后加形容词，再加名词。Opportunity“机会”，是可数名词，故前用an。故选A。