It has been raining these days. 六、过去完成时 1.概念:以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即“过去的过去”。 2.时间状语:before, by the end of last year(term, month…),by the time...,etc. 3.基本结构:had + done...
18.our products have been sold in a number of areas abroad. 我们的产品行销海外许多地区。 19.It's our principle in business to honor the contract and keep our promise. "重合...
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