whether 和 if 的选择题I don't know ____________this evening.A. if he will be free B. whether he is free 改选哪个 要解释清楚 谢谢各位为什么不用将来时呢

I don't know __ he will come tomorrow.___he comes,I'll let you know.A.whether;if B.if;whether C.when;whether D.that;if请做答并解释,最好说一下相近词的区别和用法 whether 和 if 的选择题I don't know ____________this evening.A. if he will be free B. whether he is free 改选哪个 要解释清楚 谢谢各位为什么不用将来时呢 whether和if的区别 有关宾语从句的一道选择题I don't know ____ he has come ____.A.if ••• not B.whether ••• notC.whether ••• or not D,whether ••• not or为何不选A,在宾语从句中if I don’t care ____ she has no money.I care____ she is honest or not.A.if…if B.whether…whether C.if…whether D.whether…if选哪个?个人感觉B和C都对呀 我知道第二个空填whether,至于第一个,感觉whether和if都可以 到底选 I don't know _________he will come or not tomorrow.________he come,I will tell you.a.if If b.if Whether c.whether If d.whether Whether if和whether I don't know ____ she will go tomorrow .____ she goes ,I ' ll tell you .I don't know ____ she will go tomorrow .____ she goes ,I ' ll tell you .A.if ,Whether B.whether ,Whether C.if ,That D.if ,Ifif和whether如何区别,这道题如何 whether 和if 的区别 .whether ...or not .一句话 If 和whether 的区别!什么情况下要用whether? 在英语复合句的选择题中,若出现whether和if,为何大多数情况下都选whether?请以名词性从句举例 if 和whether的用法和区别 英语从句选择题1道Do you doubt ( ) i believe youA that B which C whether D if选a 为什么不选c,它不是有是否的意思吗? 此句IF和WHETHER可替换吗I asked her if she wanted tea or coffee or ice-cream.if的位置可以用whether吗 whether和if的区别及用法. if not和whether or的区别 请问if和whether的区别. whether和if的区别快 wonder if和wonder whether的区别