情问：I don't know --------怎么填？

这是宾语从句的语法,后面要用陈述语序,选D.

宾语从句
一 定义 :在复合句中起宾语作用的从句叫做宾语从句.
二 种类 :
1 由that引导的宾语从句－－－当从句是陈述句时，用that引导宾语从句．在口语和非正式文体中，that可以省略
I know ( that ) you like English .
He told me ( that ) he would go there next week .
2 由whether / if 引导的宾语从句－－－当从句是一般疑问句，选择疑问句或反意疑问句时，用whether / if引导宾语从句,并且要把疑问的语序变为陈述的语序．一般情况下，whether / if可以替换．但下面四种情况，只能用whether引导宾语从句．
He asked me whether / if I liked my job .
I want to know whether / if you'll come to the party .

(A)当句子中出现 or not 时，必须用whether引导宾语从句
I want to know whether or not youlike me .
I want to know whether you like me or not .

(B)当主句的谓语动词是由”动词＋介词”构成的短语时，必须用whether引导宾语从句
They're talking about whether they'll go there.

(C)当宾语从句为了起强调作用，放在句首时，必须用whether引导宾语从句
Whether you like me , I want to know .

(D)当 if 容易引起歧义时，必须用whether引导宾语从句

Please let me know if youlike it .
(宾语从句 ， if =”是否”）

Please l