It's hard to notice whether a painting has been turned upside down ( ) it is an abstract modern painting.
It's hard to notice whether a painting has been turned upside down ( ) it is an abstract modern painting.
A、when
B、though
C、unless
D、for
【正确答案】:A
【题目解析】:when 引导时间状语,句子含义是当挂的是抽象派画时,很难知道它是不是被挂反了。其他关联词含义不适合。
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