He said he ________ me a present unless I ________ in doing the experiment．A.had not given; had not succeededB.would not give; succeededC.will not give; succeedD.would not give; will succeed
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B解析在时间、条件或让步从句中用一般时表示将来时。本题有he said，故为过去时。主句用过去将来时，故选B项。