单项选择题

They were also quite sure( )a cigarette end did not start the fire.

A. that
B. what
C. which
D. who
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Give me your( )for going there.
A. reason
B. cause
C. because
D. since
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He owned (that) he( )a mistake.
A. was made
B. has made
C. made
D. had made
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