IF/ YOUR/ NOT HELP/ I / NOT MEET/ MY BROTHER/ LAST MONTH/./A. IF Y...

44. If/ your/ not help/ I / not meet/ my brother/ last month/./A. If you didn’t help me, I couldn’t meet my brother last month.B. If you hadn’t help me, I didn’t meet my brother last month.C. Had you helped me, I couldn’t meet my brother last monthD. If you hadn’t helped me, I couldn’t have met my brother last month.