在职研究生英语（一）
下面句子的主干是哪一项？ The decline in wild bee num…
第 4 题单选题模拟题中等
下面句子的主干是哪一项？
The decline in wild bee numbers, according to several field studies, is linked less to any single pesticide than to a mix of disease, poor diet and the loss of flowering land.
插入语主干识别长难句并列结构