问题
选择题
27. The Grand Theatre in Shanghai is open to visitors during the daytime ______ there is a performance going on.
A．when
B．except for
C．except when
D．Except
答案
答案：C
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27. The Grand Theatre in Shanghai is open to visitors during the daytime ______ there is a performance going on.
A．when
B．except for
C．except when
D．Except
答案：C