After______,herealizedthathewaswrongindoingthat.
A.sometimesB.sometimeC.sometimeD.sometimes
I,_______yourgoodfriend,willtrymybesttohelpyouout.
A.who,isB.which,isC.that,isD.who,am
Whocanthinkofasituation________thiswordcanbeused
A.whichB.thatC.whereD.inthat
第三题为什么不能选D,在语法上有什么错误吗?