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C. misunderstand
D. being misunderstanding
9.The main reason we should learn letter-writing is ____________ by studying the rules and practicing the skills of letter-writing, we can learn to write proper letters.
A. why
B. that
C. what
D.
∕
10.The written word stands as a permanent record of precisely ____________ was communicated on a specific date.
A. that
B. which
C. what
D. as
11.We appreciate ____________to explore the market for our products.
A. your efforts
B. you make efforts
C. of your efforts
D. you to make efforts
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