单选题
My brother and I really have no idea as to ______ about this sudden change of the situation.
A、
what to do
B、
to do what
C、
how to do
D、
how can I do
【正确答案】
A
【答案解析】
[名师精解] 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。 [解题秘籍] 见第29题题解。
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