271. 答案：D
解析：根据句子意思，这里需要“过去正在走来”的意思，故用过去进行时。又如：
He opened his eyes and saw that his companions were going away.
272. 答案：B
解析：be to do sth. 是“按照规定要做某事”的意思，属于将来时，如：The branch managers were to have a meeting that afternoon. /The supervisor said that some of the trainees were to graduate the next month.
273. 答案：B
解析：at the moment = now, 所以用现在进行时。“被接见”要用被动式，故用is。再如：That kind of orange is being sold at the mall now. /At the moment Miller is installing a machine.
274. 答案：D
解析：this 决定时态与现在有关。因为是“至今为止第一次”，故用现在完成时。又如：This is the first time that they have sung a pop song.
275. 答案：B
解析：is 这个现在时的动词决定“我曾遇到”(I have met )是现在完成时。
276. 答案：B
解析：It’s = It is 。is 相当于has been ，从过去一点时间开始，故“自从”后面的动词应是过去时。如：It is two months since they graduated from college.
277. 答案：C
解析：no sooner … than … 是固定搭配，意思是“刚##就##”，如：He had no sooner woken up than the alarm clock rang.
278. 答案：D
解析：broke in 发生在“过去正在做饭”的一段时间内，故用was cooking。如：Jerry was reading a thesis when someone knocked on the door.
279. 答案：D
解析：从过去一点时间(6 o’clock this morning )到“现在累了”(am tired)，而且是“正在干家务”，故用现在完成进行时(have been doing)。例如：He has been learning geometry ever since then.
280. 答案：C
解析：两年前的动作当然要用过去时。再如：They fought for their motherland when they were young. 表示过去的状态也用过去时，如：They were healthy years ago.
281. 答案：B
解析：进行时的用法之一是表示暂时情况，此句中的过去进行时还有自责的含义。例如：She was clever, but when she decided to marry him she was being foolish. /He is tricky but now he is being honest.
282. 答案：B
解析：表示真理和现在的固定事实要用一般现在时，如：He said the universe is eternal. /Hans told them that a friend in need is a friend indeed.
283. 答案：A
解析：had been 发生在过去时(ruined)之前，故用过去完成时，如：He sang a song that had been popular for a long time.
284. 答案：B
解析：had been busy 发生在called 之前，故用过去完成时。例如：Nobody had ever expected that he could say that.
285. 答案：A
解析：had been delivered 发生在opened 之前，故用过去完成时。因为是“被送”， 故还须用被动语态。例如：He put away all the money that had been saved.
本文选自新东方在线论坛。
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