---Alice, you look puzzled, Have you und...

---Alice, you look puzzled, Have you understood it?

---Yes．I _____another problem just now．

A．l have thought of	B．am thinking of
C．had thought of	D．was thinking of

D 【解析】试题分析：考查时态：根据句意：--Alice，你看起来很困惑，你懂了吗？--是的，刚才我在考虑另外的问题。说明think of another problem是刚刚正在发生。用过去进行时。选D 考点：考查时态

考点分析：

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