Thinking about the fact that I was not prepared well enough,and _______ to lose my face,I gave up this year’s civil service exam.

A．didnt want

B．not wanted

C．not wanting

D．not to want

甲物质是一种重要的有机化工原料。一定质量的甲和48g乙按下图所示充分反应，当乙完全反应时，可生成44g丙和36g丁，则甲中所含各元素的质量比为

A．C:H=12:1

B．C:H=3:1

C．C:H:O=6:1:8

D．C:H:O=3:1:4