Mr Smith expects ____here much longer because he has lots of things to do. A. to keep B. keep C. to

Mr Smith expects ____here much longer because he has lots of things to do.
A. to keep B. keep C. to stay
【答案】C
【解析】
【详解】句意：史密斯先生由于有许多事情要做，期待在这里呆得更长时间。
考查非谓语动词。to keep保持，动词不定式； keep保持，原形； to stay停留；待，动词不定式。短语expect to do sth.期待去做某事。根据题意，故选C。