85.Agriculture is the country's chief source of wealth, wheat _____ by far the biggestcereal crop.

　 been

　 being

正确答案：D

解析：

解析:语法规则。wheat being by far the biggest cereal crop为独立主格结构。若用is,句子就会出现双主语,产生句子堆砌问题。农业是该国的主要财富来源,小麦是其最主要的粮食作物。

218.The following determiners can be used with both plural and uncountable nouns EXCEPT _______.

217.Which of the following sentences contains subjunctive mood?

216.Which of the following is a compound word?

215.Facing the board of directors, he didn’t deny ________ breaking the agreement.

214.Which of the following sentences is INCORRECT?

213.Which of the following prepositional phrases is an adverbial of concession?

212.A:Mother, you promised to take me out. B:Well, _________.

211.Which of the following prepositional phrases can function as an adverbial?

210.Which of the following contains an adverbial clause of cause?

209.Which of the following best explains the meaning of “Shall we buy the tickets first”?