sat语法求大神、、、（Although) i can't (concur in) the spea

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（Although) i can't (concur in) the speaker's opinions,I am graceful for the opportunity (to haver heard) (them) expressed so eloquently.
答案是B,换成concur with the speaker in the opinions,to have heard them 作定语 修饰机会 动作已发生过 故用完成式
Greta Garbo,the sensational and talented Hollywood star off the (1930s),became a recluse for most of her adult life and (remained) isolated but (looking) (beautifully) until the day she died.
答案是D,我知道D错了,应该用形容词作动名词looking的表语 LOOKing是 remained 的并列表语 与主语 是主表关系off the 1930s,o早在30年代
(As) Katie opened the refrigerator,she instantly noticed that a huge chunk of chocolate icing had been (bit) (off) the birthday cake and immdiately suspected that Mark was responsible.
答案是B.bite 的过去分词 是bitten 不过 bit 也可以 当过去分词用啊
Africa's Kanem empire,after (enduring for) over a thousand years,(is) believed to have fallen (into decline) when trade centers (shift) outside its boundaries
A for是介词 over这里是副词 是超过的意思 不重复
答案D.动词时态不对 改为过去时 是动词不定式的 时间状语
The museum,which (has sponsored) free programs in the arts for city children since the late 1960s,was (cited) (by the mayor) for （their） many civic contributions .我选了C,答案D,为什么改成MAYORS我认为答案 是 E