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CCS10.3.1 content assist功能无法激活

使用CCS版本为10.3.1版本,在preferences中已经设置了Shift+Tab作为我的代码补全即content assist快捷键,  如图所示;但是实际使用时一直无法激活,一直显示“No completions available”, 这个问题该如何解决?