单项选择题

______ they invite you to speak, remain silent.

A. Even though
B. Though
C. If
D. Unless
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单项选择题
Albert Einstein. the greatest scientist in the 20th century, once ______ an offer of $1,000 a minute to speak on the radio.
A. turned down
B. turned up
C. turned out
D. turned in
单项选择题
Though he was born and raised in America, he can speak ______ Chinese.
A. smooth
B. fluent
C. fluid
D. flowing
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