请问这句话的主句和谓语动词分别是什么? oil rigs have to be repaired frequently and divers,who often have to work oin darkness a hundred feet under water,have been frightened out of their wits by giant fish bumping into them as they work.
主句oil rigs have to be repaired frequently and divers have been frightened out of their wits by giant fish bumping into them as they work. 谓语动词repaire ,been