—How is your plan getting along?—I can’t carry on any longer.Someone must help me.A. sing

问题补充：

—How is your plan getting along?

—I can’t carry on any longer.Someone must help me.

A. single

B. simply

C. alone

D. lonely

答案：

A. single

B. simply

C. alone

D. lonely

解析：C

解析从题意看此处应用副词，首先排除A、D两项。由句意可知选alone，意为“独自，单独”。