问题
. It is important to know exactly the message ________ and ________.
A:you want to send it to people; that you try to get them to do
B:sent to people; what do they want to do
C:you want to send; which you want people to know
D:you want to send to people; what you are trying to get them to do
B:sent to people; what do they want to do
C:you want to send; which you want people to know
D:you want to send to people; what you are trying to get them to do
正确答案是：
