He thought he had forgotten________the door，so he hurried home．But on the way home，he suddenly remembered________the door．He didn't have to return home．
A.to lock，to lock
B.locking，locking
C.to lock，locking
D.locking，to lock
网友回答
C解析分析：从动作本身来说，要么“锁了门”，要么“没有锁门”，但此处he thought是“他认为”，因此不一定是个事实。由he hurried home可以知道是“忘记去做”，由He didn't have to return home可以知道“记得曾经做过”。所以选C项。