Not until I began to work ______ how much time I had wasted.　
A．didn't I realize　 　B．did I realize　　
C．I didn't realize　D．I realize
B

試題分析：句意，直到我開(kāi)始工作，我才意識(shí)到自己已經(jīng)浪費(fèi)了很多時(shí)間。not until，引導(dǎo)的時(shí)間狀語(yǔ)從句置于句首，從句要用陳述語(yǔ)序，主句要用倒裝語(yǔ)序，故選B。
點(diǎn)評(píng)：not until，引導(dǎo)的時(shí)間狀語(yǔ)從句置于句首，從句要用陳述語(yǔ)序，主句要用倒裝語(yǔ)序。
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