must have done , or (otherwise)+ would have done (二)学位英语真题选编 1、Mr. Green ___ my letter, otherwise he would have replied before now. A. must have received B. must have failed to receive C. must receive D. must fail to receive 2、I believe ...
Michael said that he would try harder the next semester. Jennifer wondered who had taken her umbrella by mistake. 特殊情况: 1. 从句说明的是一般真理、客观事实、自然现象、名言时,仍用现在时。 The boy’s father told the boy that water freezes when the ...
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