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I don't know if he is coming. Here "if" is used to

ADescribe a permanent situation

BRefer to the past

CIntroduce a comparison

DTo express a doubt

Answer:

D. To express a doubt

Read Explanation:

We use 'if' to introduce a possible or unreal situation or condition.


Related Questions:

If you throw the knife,____________
Can he meet you at the office,_____________________
She would buy a pony,if ..... enough money.
Choose the correct form of the auxiliary verb that agrees with the subject. The information provided to you _____ wrong.
(a) I will not be / (b) able to come in / (c) in case it will rain / (d) no error.