题目

He was very busy yesterday，otherwise he__________to the meeting. A.would come                                          B.came C.would have come                                   D.had come 答案：C 解析: otherwise用来表示一种含蓄的虚拟假设，因为是对过去(yesterday)的情况的假设，所以应该用would have come形式。 Look! There’s no light on—Sara _____be at home. A. can’t                B. mustn’t          C. needn’t          D. shouldn’t