Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
A、wasnotC
语法题：虚拟语气。
Wateriscomposed_______hydrogenandoxygen.
_______ for your laziness，you could have finished the assignment by now.
It is important to ________ your skin from the harmful strong sunlight.
Aftermonthsofvoyage,Columbusarrivedin______laterprovedtobeanewcontinent.
She has no hostility to us, _____can be judged from her eyes。
