Remember to do this in time of H1N1 ---         constantly the windows to let fresh air enter and move around inside, and avoiding the access to the crowds, a necessity everyday.
A．openB．we openC．opening;D．to open
C
“---”后是this的同位語(yǔ)，即名詞性短語(yǔ)，而且根據(jù)and后面的avoiding the access to the crowds，（and前后結(jié)構(gòu)對(duì)稱），所以選C.
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