问题描述：
1.He enjoys （ ）physics at school.
A.have B.to have C.having
2.I like （ ）with my friends （ ）summer（夏天）.
A.to swim ；at B.swimming；at C.swimming ；in
A.have B.to have C.having
2.I like （ ）with my friends （ ）summer（夏天）.
A.to swim ；at B.swimming；at C.swimming ；in
问题解答：
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