1,句子的骨干是“主系表”結(jié)構(gòu).
主語：It
系動詞：is
表語：a world federation
定語從句：which is composed of various associations ,修飾federation .
2,句子不完整,只有條件狀語從句Once you know where the gaps are,這個條件狀語從句中又有賓語從句where the gaps are,做know的賓語.但句子沒有主句.
3,句子的骨干是個“主語+賓語+賓補(bǔ)”的結(jié)構(gòu).
主語：This
謂語：makes
賓語：it
賓補(bǔ)：the logical choice
定語從句：that does business internationally or that serves customers,修飾organization ,這個定語從句當(dāng)中又有定語從句who demand an international standard of quality ,修飾customers.