单项选择题

Nancy's gone to work but her car's still there. She ______ by bus.

A. must have gone
B. should have gone
C. ought to have gone
D. could have gone
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单项选择题
School started on a ______ cold day in February.
A. severe
B. bitter
C. such
D. frozen
单项选择题
His ______ in gambling has eventually brought about his ruin.
A. indulgence
B. habit
C. action
D. engagement
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