问题
选择题
There are some police cars in front. What do you suppose ____?
A．is the matter
B．is happened
C．is the wrong
D．the trouble is
答案
答案：A
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.