That was a difficult question, but Mary still _______ to work it out.
A.did B.failed C.kept D.managed
出自:统考 英语

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块