4.
(2分)Few of us thought that the problem was worth _________

A. discuss
B. discussing
C. discussed
D. to discuss
出自:长安大学-大学英语3

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