问题
单项选择题
This phenomenon still has many of them wondering their heads.
A．fidgeting
B．meditating
C．worrying
D．scratching
答案
参考答案：D
解析：[分析] 词语运用 scratch one's head表：认真地思索一个难题；例：This crisis has politicians scratching their heads and wondering what to do．(这场危机令政治家们苦思不得其解。)；本句意为：这一现象仍令他们苦思不得其解。因此D为答案。