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If they __________ earlier than expected, they __________ here now.

A. had started, would be                            B. started, might be

C. had started, would have been                  D. will start, might have been

If they ____ earlier than expected, they ____ here now.

A. had started, would be                                   B. started, might be

C. had started, would have been                  D. will start, might have been