Only after he had received the patent (专利) _______ to spend a day away from his lab.[ ]A. had he decidedB. did he decide C. that he decided D. he would de-高中英语-n多题

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Only after he had received the patent (专利) _______ to spend a day away from his lab.

[ ]

A. had he decided
B. did he decide
C. that he decided
D. he would decide

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