I must be off now. My friends ________ outside.
A．wait
B．have waited
C．are waiting
D．were waiting
答案：C
题目分析：考查时态。根据上文的must be说明是对现在的情况进行说明，因为“must+动词原形”说明对现在的情况进行推测。故C正确。句意：我现在必须得走了，我的朋友在外面等我。
点评：时态的考查要放在上下文的语境中进行，同时也要注意句子的关键的时间状语。
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| Jim is the son of a farm owner. One New Year's Day, when he was 15 years old, his father 1 him to work on the farm for one year at his free time. Jim was 2 with his father's idea. "That isn't my job. I have 3 school work to do." At hearing this, his father said, "I promise (答应) to give you the best present if you 4 finish one year's work." Jim thought for a while and 5 . Starting one Saturday, the boy got up early and worked 6 until evening, just like any other farmer. Time passed 7 . Jim's crops grew very well. On the last day of the year, the father called his son to him. "I'm happy to see that you have worked very hard the whole year," said the father. "Now, tell me 8 you want." The boy smiled and showed his father a big piece of bread made from his wheat. "I've already got the 9 present. No pains, no gains. I think this is what you wanted me to 10 ." His father was very pleased to hear that. | ||||
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