enough time, but I couldn’t do it better. A. I was givenB. GivenC. To be givenD. Though I

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(答案→)A. I was given
B. Given
C. To be given
D. Though I was given
解析：因为but是并列连词，后面是个句子，前面也一定是个句子，而不是一个分词短语或不定式短语，更不能再用连词though，所以排除B、C和D。