i believe 的确是插入语,插入语的特点是解题时可以直接无视,那么本题就变成“ __________,and he could pass the examination." 如此,答案清晰可见.B是唯一的正确答案.而且,本题也是常见的句式,"祈使句+ and you 'll / and he could." 放心大胆选B吧,包您正确.
应该选A。 实际上,2个答案意思接近,这题是考句子成分的。 主干是I believe (that),后面接的这个宾语从句 he could pass the examination ,从句成分完整,那么2个选项在从句中只能做状语,他们的主语是he,A选项中应该是省略了(with)a bit more efforts,练起来就是I believe (that) he could pa...