Located at the upper end of each______an adrenal gland, an integral part of the endocrine system.
(A) kidney which is
(B) kidney is
(C) kidney being
(D) kidney
答案B
我選A
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看了答案之後覺得答案應該是B沒錯,因為句意比較順
但是作答時看不到答案啊 〒_〒
想請問為什麼A不行,勉強來說它也算接了一個完整的子句...
希望知道的人可以指導一下,謝謝...