单项选择题

There are still several unanswered questions______ with the accident.

A. connect
B. to connect
C. connected
D. connecting
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单项选择题
I lay on the bed, ______ to the radio.
A. listen
B. hear
C. listening
D. hearing
单项选择题
Her ability has been doubtful after a number of ______.
A. failures
B. successes
C. fails
D. losers
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