【题目】Tom could do nothing but______to his mother that he was wrong.
A.admitting
B.admits
C.admit
D.to admit

【答案】C
【解析】考查固定句型。句意：汤姆只好向妈妈承认他错了。can/could do nothing but do sth.“除了做…别无选择，只好做…...”，but为介词，此处后跟不带to的不定式，即动词原形形式。故选C。