Question

Mary is always ready to do some __ work at the local geracomium（敬老院）in her spare time.

A．responsible

B． exhausting

C．voluntary

D．professional

Answer 1

C

句意为：玛丽总是乐意在业余时间到当地的敬老院做些志愿工作。voluntary“志愿的；无偿的；自愿的”；符合句意。responsible“有责任的；负责的”； exhausting“令人筋疲力尽的；使人疲惫不堪的”； professional“专业的”。