專四100條閱讀難句：sentence 29

　　While many good and useful claims are being made, it is clear there is a long way to go in ensuring shoppers are adequately informed about the environmental impact of the products they buy. (05.6 Passage 2)

　　分析主干：it is clear that...

　　句首的While 引導(dǎo)讓步狀語從句，“盡管”......。it is clear......中，it 是形式主語，省略連接詞that 的從句there is...才是句子的真正主語。in ensuring...是there be 句型的狀語成分，“在確保......方面”。ensuring 后面接的是省略that 的賓語從句。

　　譯文：雖然有許多好而有用的聲明，但是，很明顯，要確保購買者完全知曉所購產(chǎn)品對(duì)環(huán)境的影響還需要很長(zhǎng)的時(shí)間。