问题 填空题 按要求写出单词的正确形式。1. before (对应词) _____________ 3. cheap (反义词) _____________5. dollar (复数) _____________2. gift (同义词) _____________4. buy (同音词) _____________6. cost (三单) _____________ 答案 1. after 2. present 3. expensive / dear 4. by 5. dollars 6. costs