have not heard from Mark for a long time.I’m quite worried a

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have not heard from Mark for a long time.I’m quite worried about him.
— I have not heard from Mark for a long time.I’m quite worried about him.— OK.I’ll let you know the minute I ___ anything..A.will hear B.am hearing C.heard D.hear
为什么选D,

主将从现（主句用一秀将来时WILL LET YOU KNOW .,从句用一般现在时）

have not heard from Mark for a long time.I’m quite worried a （） I from my brother for a long time.A.not have heard B.have not,time,Tom,we,for,from,a,heard,long,have i have not heard ( )you for a long time (1/2)－I have not heard from Henry for a long time.－What do y Dear Jim,How are you?I have not heard from you for a long ti i haven't heard from her for a long time什么时态?haven't heard 换 I haven't heard from Henry for a long time.But I don't know -We haveng't heard from jane for a long time. I haven't heard from Kelly for a long time .(同义句转换) --I haven't heard from Jane for a long time .-----What ____ i haven't heard from her for a long time什么时态?