第4题: [单项选择]The road is wet. It ______ last night. A. should have rained B. must have rained C. could have rained D. must rain 参考答案:B 答案解析:must与动词的完成时态连用,表示对过去的情况进行肯定的猜测。如表示否定猜测,则用can't+动词的完成形式。
第15题: [单项选择]The Words of his old teacher left a ___________ impression on his mind. He is still influenced by them. A. long B. lively C. lasting D. liberal 参考答案:C 答案解析:[译文]老师的话在他心里留下了永久的印象,那些话仍影响着他。
[题解]形容词辨义及词汇的搭配:long“长”,指长度,往往不与impression搭配使用;lively“活泼的”;lasting“永