in case 有以防万一 的意思 是状语 修饰 一般放句末。 for fear that要引导一个从句 同义句some parents don't allow their children to go online for fear that they are affected by something unhealthy
for fear that 有担心害怕的意思,这里逻辑不通,父母不让小孩上网是为了防止小孩被不良信息感染,而不是因为担心害怕发生这件事情。不知这样解释是否牵强?
for fear that 后面的陈述句,要加情态动词
如果这里你要选A,那么后面应该修改为
for fear that they would be affected by something unhealthy