we are still uncertain ( )Bob is the roght person for the jobA,as to whether B.as to C.about D.ever since

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wearestilluncertain()BobistheroghtpersonforthejobA,astowhetherB.astoC.aboutD.eversincewearestillunce

we are still uncertain ( )Bob is the roght person for the jobA,as to whether B.as to C.about D.ever since
we are still uncertain ( )Bob is the roght person for the job
A,as to whether B.as to C.about D.ever since

we are still uncertain ( )Bob is the roght person for the jobA,as to whether B.as to C.about D.ever since
选A吧
be certain +that + 句子
be uncertain +whether/if...
as to "至于;有关" ,相当于介词,后可加whether引导的宾语从句