12．Before space travel，an astronaut must know        it might feel like to stay in an imaginary environment．（　　）
A．whenB．whatC．howD．that

分析 天空旅行之前，宇航員必須知道這一個(gè)虛幻的環(huán)境里感覺(jué)會(huì)是什么樣的．

解答 答案：B
題干中it might feel like to stay in an imaginary environment是作動(dòng)詞know的賓語(yǔ)，是一個(gè)賓語(yǔ)從句；從句中feel like缺少賓語(yǔ)，要用連接代詞．故選B．

點(diǎn)評(píng) 從屬連詞是連詞的一種，用來(lái)引導(dǎo)名詞性從句和狀語(yǔ)從句．大致可分為三大類：that（無(wú)詞義，不做成分）if，whether （表達(dá)是否的意義，但不做句子成分）； 連接代詞：who，whom，whose，what，which，whatever，whoever，whichever（有詞義，在句子中可作主語(yǔ)、表語(yǔ)、賓語(yǔ)）；連接副詞：when，where，why，how，how many，how long，how far，however，whenever，wherever （有詞義，作從句的狀語(yǔ)）．學(xué)習(xí)時(shí)，要注意區(qū)分和掌握．

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