【题目】With so much work _______to be done，the physician looked very worried.
A. having remained B. to remain
C. remaining D. remained
在线课程【答案】C
【解析】
试题分析：考查remain用法。动词“remain仍然”的形容词形式为remaining剩下的，留下的；构成动词句式：sth remain to be done某事有待于被做；两个结构结合在一起形成remaining to be done。该结构作为宾语补足语。句意：有如此多的工作有待于被做，这位医生看起来很担忧。故C正确。