My brother and I really have no idea as to ______ about this sudden change of the situation.

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问题 My brother and I really have no idea as to ______ about this sudden change of the situation.

选项 A、what to do
B、to do what
C、how to do
D、how can I do

答案A

解析 介词后面疑问词的跟法为:介词+疑问词+不定式。或者是:介词+疑问词+主语+谓语动词+其他成分。注意:见第29题题解。
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