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

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

选项 A、whether
B、that
C、why
D、when

答案B

解析 同位语从句引导词。doubt在否定句中(there is no doubt...)带同位语从句时引导词通常是that;在肯定句中(there is some doubt...)则一般用whether,因此答案为B。
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