单项选择题
The training is（）for every type of communication.
A.worthless
B.invaluable
C.costless
D.value
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But even if you never give another speech in your life, you still have much to（）from studying public speaking.
A.gain
B.grain
C.train
D.rain -
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The interaction of these seven elements is（）determines the outcome in any instance of speech communication.
A.what
B.that
C.how
D.which -
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Your speech class will give you an opportunity to gain confidence and make your nervousness work for you（）against you.
A.more than
B.other than
C.less than
D.rather than
