问题补充：
Jack had a wonderful time many interesting places in Beijing and he had much time the city.
A. to visit; to enjoy
B. to visit; enjoying
C. visiting; to enjoy
D. visiting; enjoying
答案：
A. to visit; to enjoy
B. to visit; enjoying
(答案→)C. visiting; to enjoy
D. visiting; enjoying
解析：visit参观，访问；enjoy喜欢，享受。句意：在北京参观了许多有趣的地方，杰克玩的很高兴，并且他有很多时间来享受这个城市。现在分词作状语表示正在进行的伴随性动作，不定式做状语表示具体的将要进行的动作。结合语境可知选C。
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