单项选择题

On reaching the top floor I suddenly realized that I () my keys on the car.

A.leaves
B.left
C.had left
D.was left

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It was the old man () has reported the murder．

A.that
B.which
C.who
D.whom
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Helen always comes home at weekends, () the country to the town.

A.preferring
B.to prefer
C.prefer
D.having preferred
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