Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
C
语法题：虚拟语气。
Ittookmeamonthtogetrid_______thecough.
Thebookfairhasreceivedapositive________fromreaders.
支持代孕的理由有
Wateriscomposed_______hydrogenandoxygen.
Theyareeager_______abroad.
