dongc123
幼苗
共回答了13个问题采纳率:92.3% 举报
其实语法方面我也不是很擅长~
首先“the shift from traditional to cosmetic dentistry”是主语,短语做主语.
is后面接宾语,宾语做先行词引导从句(是宾语从句么?!嘛,总之是个从句就是了),而这里的“because adults are getting fewer cavities and becoming more vain.”是明显是在解释说明,可是为什么解释说明呢?所以全句缺少了个宾语~
举个例说,他因为晚起迟到了.he was late because he got up late.
总不能说he is because he got up late 吧……
所以在这句中because引导的从句缺少个名词或名词短语做先行词引导~
1年前
6