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【单选题】
对于那些已经应用的样式我们又想将它们取消，以下哪种操作是错误的？（）A.
可以在图层面板中将效果栏拖移到“删除图层”按钮上
B.
选择“图层”菜单下的“图层样式”中“清除图层样式”命令
C.
选择图层，然后点击图层面板底部的“清除样式”按钮
D.
D、以上B的操作正确
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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A.
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B.
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D.
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A.
could have been
B.
should have been
C.
must have been
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【单选题】-----Who has made a mess in my room? -----Who else it but your naughty son?
A.
could do
B.
could have done
C.
did
D.
had done
【单选题】-- Who do you think _____ such a foolish thing? -- It _____ Tom, but I’m not sure.
A.
could have done; may have been
B.
could have done; must have been
C.
should have done; may be
D.
must have done; might have been
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