V1. 有個全句劃線的，然後我末了選了that開首的句子，由於誰人句子內裏A項有兩個謂語，一個had一個is，所曩昔面確定是個從句照樣甚麽的...
V2. 講到句子構造忽然想道題：特別疑難詞引誘的從句做主語，只要意想到這個從句裏缺乏be動詞is，然後主句無謂語，就能夠選出來了。選項似乎是is would be...
V3. 主謂同等的也許考了2個，都是主語和謂語之間夾了很長的潤飾語，要找準主語
相似考題
The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic peoples has been established by carbon dating, but what is much more difficult to determine are the use to which primitive peoples put the caves, the reason for their decoration, and the meaning of the magnificently depicted animals.
A.has been established by carbon dating, but what is much more difficult to determine are
B.have been established by carbon dating, but what is much more difficult to determine are
C.have been established by carbon dating, but that which is much more difficult to determine is
D.has been established by carbon dating, but what is much more difficult to determine is
E.are established by carbon dating, but that which is much more difficult to determine is
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