12．Noboby knows if he      ．If he       here，I'll call you at once．（　�。�
A．will come；will arriveB．will come；arrives
C．comes；will arriveD．comes；arrives

分析 沒(méi)有人知道他是不是要來(lái)．如果他到了，我將立刻給你打電話．

解答 答案：B 根據(jù)Nobody know，可知其后的if含義為是否，引導(dǎo)的是賓語(yǔ)從句，從句中的時(shí)態(tài)，要根據(jù)實(shí)際情況判斷．沒(méi)人知道他是否要來(lái)，應(yīng)該用一般將來(lái)時(shí)（will+do）．其后的if引導(dǎo)的是條件狀語(yǔ)從句，符合"主將從現(xiàn)原則"．故if后的從句應(yīng)該用一般現(xiàn)在時(shí)．主語(yǔ)he為三單，故謂語(yǔ)動(dòng)詞arrive應(yīng)該用三單形式arrives．故選B．

點(diǎn)評(píng) 考查if的題目，一般會(huì)含有一個(gè)賓語(yǔ)從句和一個(gè)條件狀語(yǔ)從句．從句的時(shí)態(tài)該如何判斷是做題的關(guān)鍵．

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