Tom is a careless person. He forgot ____ the door again when he went out yesterday.
A、to lock
B、locking
C、to have locked
D、having locked
34.
A、might not
B、might
C、must not
D、must
4.In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation.