20．I was about to greet him         I realized that I couldn't tell his name．（　�。�
A．sinceB．whenC．asD．while

分析 我正準(zhǔn)備迎接他，就在那時我發(fā)現(xiàn)自己叫不出他的名字．

解答 答案：B 句型搭配，be about to do sth when加從句，表示正準(zhǔn)備做某事，就在那時…；since從…開始，as一邊…一邊…，while然而；when除了表示當(dāng)…時候，還有at that time正在那時的含義．故選B．

點(diǎn)評 從屬連詞是連詞的一種，用來引導(dǎo)名詞性從句和狀語從句．大致可分為三大類：that（無詞義，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、表語、賓語）；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）．學(xué)習(xí)時，要注意區(qū)分和掌握．

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