根据句意,主句动作发生在从句动作之前,从句为一般过去时,所以主句为过去完成时,结构是“had+过去分词”。 点击查看解析 06 -\-\- When did the classroom have a power cut? -\-\-This morn...
2. He has to stay in bed for 3 or 4 days becauseof his illness. 因为他的病,他不得不卧床 3 到 4 天。 疑问句的答语不同: 对must 开头的一般疑问句作肯定回答时用 must,否定回答则用 needn't 或 don't /doesn't have to;包含 have to 的句子变为一般疑问句或否定...
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