单选题There are some police&nbs

问题补充：

单选题Therearesomepolicecarsinfront.Whatdoyousuppose____?A.is the matterB.is happenedC.is the wrongD.the trouble is

答案：

A解析do you suppose是插入语。另：Can you tell me what is the trouble?虽然是宾语从句但还是要用what is the trouble而不是what the matter is.