29. His car got stuck in the mud, so he ______ get off and asked the villager nearby to help him.
A. can

B. had to

C. used to

D. may

原题解析：
A. can 能够
B. had to 不得不
C. used to 过去常常，习惯于
D. may 可能，或许
参考译文：他的车陷进泥里了，因此他不得不下车，并向附近的村民求救。
正确选项为B。