问题详情

When the writer says, ""you must steer a middle course," he means that______.
A．you should speak neither too loudly nor too softly
B．you should speak neither too formally nor too colloquially
C．you should write as well as speak
D．you should not come to any definite conclusion about what is proper or not proper in speech此题为多项选择题。请帮忙给出正确答案和分析，谢谢！