Can you tell me ___Mr.LI is here?Sorry,he isn't here.If the ___,I'll call you.A whether returnedB if returns第二个空明白,第一个为啥不能用whether

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Canyoutellme___Mr.LIishere?Sorry,heisn''there.Ifthe___,I''llcallyou.AwhetherreturnedBifreturns第二个空明白,第

Can you tell me ___Mr.LI is here?Sorry,he isn't here.If the ___,I'll call you.A whether returnedB if returns第二个空明白,第一个为啥不能用whether
Can you tell me ___Mr.LI is here?Sorry,he isn't here.If the ___,I'll call you.
A whether returned
B if returns
第二个空明白,第一个为啥不能用whether

Can you tell me ___Mr.LI is here?Sorry,he isn't here.If the ___,I'll call you.A whether returnedB if returns第二个空明白,第一个为啥不能用whether
选 B
第一个空可以用whether,只是第二空不能用returned.

根据时态,第2个句子只能选一般现在时态,所以排除returned,所以排除a选项