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19、His success       the fact       he had been working hard.

A.lies in, which                                              B.lay in, that

C.lays in, because                                                 D.had laid in, that

19、B

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His success       the fact       he had been working hard.

A.lies in, which                                              B.lay in, that

C.lays in, because                                                 D.had laid in, that

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