作业帮it is doubtful _____ he knows it or not.
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/04 11:46:06
it is doubtful _____ he knows it or not.
it is doubtful _____ he knows it or not.
A that.B if.C.what.
D whether
请写下理由.
it is doubtful _____ he knows it or not.
A that.B if.C.what.
D whether
请写下理由.
D whether 为正确选项.
这是个主语从句,it是形式主语,真正的主语是后面whether he knows it or not.
“is doubtful” 意思是“值得怀疑的”,凡是这类“not clear,don't know”“wonder”等表示“情况还不明了或者带有疑问或者想知道”这种意思的宾语从句或者主语从句,引导词都不能用that,要用带有wh-开头的疑问词.本句正是属于这种情况.所以选whether,“是否”的意思.
值得一提的是,if也有“是否”的意思,但这里不能选它,因为它不能引导主语从句.
这是个主语从句,it是形式主语,真正的主语是后面whether he knows it or not.
“is doubtful” 意思是“值得怀疑的”,凡是这类“not clear,don't know”“wonder”等表示“情况还不明了或者带有疑问或者想知道”这种意思的宾语从句或者主语从句,引导词都不能用that,要用带有wh-开头的疑问词.本句正是属于这种情况.所以选whether,“是否”的意思.
值得一提的是,if也有“是否”的意思,但这里不能选它,因为它不能引导主语从句.
it is doubtful _____ he knows it or not.
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