If the president…. last night’s train, he.... here now.
Giải thích:
Loại phương án a, b: sau cấu trúc câu điều kiện
Trong câu có 2 từ dấu hiệu chỉ thời gian ở 2 thời điểm khác nhau (last night, now)
If + S + had + P.P (quá khứ phân từ), S + would + V (nguyên mẫu)
Dịch
Nếu chủ tịch đi chuyến tàu đêm qua, bây giờ ông ấy đã có mặt ở đây.
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