单项选择题

A series of attempts （） made, he came to a successful solution to the problem.

A. to be
B. had been
C. were
D. having been

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单项选择题
Mary could do （） but leave although she would have liked to stay and continue talking with him.

A. something
B. anything
C. everything
D. nothing
单项选择题
I saw Bill sitting in a front seat （） at the speaker with the strangest look.

A. staring
B. stares
C. stared
D. stare
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