（2010·重慶模擬）—Alice, you look puzzled．Haven’t you understood it?
—Yes．I _____of another problem just now． 
A．had thoughtB．have thoughtC．thoughtD．was thinking
D
考查時態(tài)，過去某一時刻正在進行的動作應(yīng)用過去進行時態(tài)，根據(jù)題中的時間just now，故用故去進行時態(tài)。句意：艾麗斯，你看起來很困惑，你沒明白嗎？是的，我剛才在想另一個問題，故選D。
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