听力原文:They would have been here with us by now, if they had caught the early train.<br>(29)
A. They are here with us now because they took the early train.
B. They wanted to be with us, so they took the early train.
C. They didn't take the early train, so they can't be here now.
D. Even if they took the early train, they still couldn't be with us now.