第2个回答 2018-12-27
在时间状语从句与条件状语从句中（如if/ before /after/as soon as/....引导)从句需用过去将来时需用一般过去时代替。例如：If I were you, I would study harder.典型例题He said he________me a present unless I_______ in doing the experiment. A. had not given; had not succeededB. would not give; succeed C. will not give; succeed D. would not give; will succeed. 答案B. 在时间，条件或让步主语从句中一般不用将来时。本题有He said，故为过去式。主句用将来时，故选B. 此处用一般过去式代替了过去将来时。本回答被网友采纳