Generally speaking, there are four main points of Business Communication.
A. Right time
B. Right person
C. For the space
D. To the word
拉丁舞包含五类舞蹈有：恰恰、（ ）、伦巴、（ ）和（ ）。
We arrived at the station ____ the train had left.
A. after
B. before
C. since
D. when
___ difficult the task may be, we must fulfill it this month.
A. No matter how
B. No matter what
C. No matter when
D. No matter where
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