So confused that he didn't know how to start his lecture．

A．since he became

B．would he become

C．that he became

D．did he become

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D。他如此困惑，以至于不知如何开始自己的讲座。
考查状语从句用于倒装结构。so…that引导结果状语从句，s0如果置于句首，则主句中的主谓语需要倒装，that从句不用倒装，故选择D。

1 In reading stories we anticipate what is to come________on our memory of what has gone before．

A．based

B．basing

C．to base

D．to be based

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2 But for his courage, the battle ______

A．was lost

B．will be lost

C．would lose

D．would have been lost

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3 ______ the flood, the ship would have reached its destination on time．

A．In case of

B．In spite of

C．Because of

D．But for

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