一般情况下,whether 和if 都可以用来引导宾语从句,在这题就是做know的宾语从句
但是这题如果一定要选的best one,应该是选 whether
句意是我不知道我能否在两天内完成这任务.
这里如果选if的话,除了可以表示 是否 的意思
可能还容易引起 歧义-------- 如果……
选择填空：I don't know___________I can finish the task in two day
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