1．I don't know            he will come tomorrow，           he comes，I'll tell you．（　�。�
A．if； WhetherB．whether； Whether
C．if； ThatD．if； If

分析 我不知道他明天會(huì)不會(huì)來(lái)，如果來(lái)了，我就會(huì)告訴你．

解答 答案：D．本題考查賓語(yǔ)從句和狀語(yǔ)從句．know后是賓語(yǔ)從句，用if或whether作為引導(dǎo)詞，表示是否；第二句是條件狀語(yǔ)從句，用if表示如果，故選D．

點(diǎn)評(píng) if引導(dǎo)的從句，一是條件狀語(yǔ)從句，譯為"如果"．He will come if you invite him．如果你請(qǐng)他，他會(huì)來(lái)的．
二是賓語(yǔ)從句，譯為"是否"．I wonder if she is ill．不知她是否病了．

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