一、单项选择
1．never before________this opportunity—don't miss it.
a．we have had b．we had
c．have we had d．did we have
解析：否定词放句首要用倒装语序，又因受never before和don't限制，只能用现在完成时。
答案：c
2．not until the result was announced________that he was the winner.
a．that he could believe b．he couldn't believe
c．could he believe d．he could believe
解析：not until放句首要用倒装语序，由于not已提前，后面要用肯定。
答案：c
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