There is no doubt ______ buying things online makes life a little easier.A.whetherB.thatC.

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There is no doubt ______ buying things online makes life a little easier.

A.whether

B.that

C.why

D.when

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。