单选题By far  there are ma

问题补充：

单选题Byfar,therearemanyproblems________tobesolved.A.remainingB.remainedC.being remainedD.to remain

答案：

A解析考查remain用法.remaining adj 留下的，剩下的；sth remain to be done某事有待于被做。本题的remaining to be done修饰many problems.