单项选择题

Your explanation will make the things ______.

A. even more complicated
B. to be even more complicated
C. that became even more complicated
D. be even more complicated
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单项选择题
Circus in a work by Chaucer ______ around 1380 refers to the Circus Maximus in Rome.
A. writing
B. being written
C. written
D. wrote
单项选择题
He tried ______ a new microphone and was able to make himself heard.
A. to use
B. to be used
C. to using
D. using
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