Do you know if he＿back in two hours?A.will be come B.comes C.has been D.will be怎么理解啊,这里if是作什么,具体

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Doyouknowifhe＿backintwohours?A.willbecomeB.comesC.hasbeenD.willbe怎么理解啊,这里if是作什么,具体Doyouknowifhe＿back

Do you know if he＿back in two hours?A.will be come B.comes C.has been D.will be怎么理解啊,这里if是作什么,具体
Do you know if he＿back in two hours?
A.will be come B.comes C.has been D.will be
怎么理解啊,这里if是作什么,具体

Do you know if he＿back in two hours?A.will be come B.comes C.has been D.will be怎么理解啊,这里if是作什么,具体
D."in two hours" 是一般将来时的标志.所以可排除 B.C 两项而 A 项中的 be和will 不能同时存在
这里的 if 根据句意应理解为
“是否”：你知道2小时后他是否会回来?

D,if在这里是是否的意思，引出宾语从句，可以用将来时态。当if意思是如果，引出条件状语从句，就要用一般现在时表将来。If he comes back in two hours ,he will go to the meeting.

Dif连接的是宾语从句，从句的时间状语是in two hours 是将来的时间所以从句要用一般将来时

D.
if在这里是“是否”的意思。
in two ours“2小时以后”所以要用将来时。
be back “回来”与come back的意思相同。

if作连词，是否的意思，选comes

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