A series of attempts______made, he came to a successful solution of the problem.

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问题 A series of attempts______made, he came to a successful solution of the problem.

选项 A、to be
B、had been
C、were
D、having been

答案D

解析这是一道语法题。考点是动词过去完成时被动语态的用法。

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成人本科学位英语

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A series of attempts______made, he came to a successful solution of the problem.

成人本科学位英语

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Ofthetwolectures,A(thefirst)wasbyfarB(thebest)one,partlybecausethepersonwhodeliveredC(it)hadD(sucha)pleasa

Hewasaqualifieddoctorwhorarelypracticedbutinsteaddevotedhislifetowriting.Heoncesaid:"Medicineismylawfulwif

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Tom:Iseeinthepaperthey’resendingmoreequipmenttospace.Andwemighthavetolivetheresomeday.John:______!I’mstay

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