单项选择题

We still have a lot of problems ______.

A. unsolved
B. insolving
C. unsolve
D. to be unsolved
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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
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
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