I am sorry that I have kept you ______ me so long. [ ]A. waitingB. waiting

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I am sorry that I have kept you ______ me so long. [ ]
A. waiting
B. waiting for
C. to wait
D. to wait for

答案

举一反三

People will spend more time ____ their meals.[ ]
A. eat
B. eating
C. to eat
D. ate

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The children often take time to do things like _____. [ ]
A. volunteer
B. to volunteer
C. volunteers
D. volunteering

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We are looking forward to ____ the Beijing Olympics.[ ]
A. host
B. hosting
C. be host

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After she finished her homework she went on _____ early.             [     ]
A. cleaning
B. clean
C. to clean

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—What are we going to do on Sunday?
—How about _____? [ ]
A. to go bike riding
B. going bike to ride
C. going to bike riding
D. going bike riding

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