Question

英语选择题，谢谢

1.Agriculture is the country's chief source of wealth,wheat__by far the biggest cereal crop?
A.is B. being C.be D been

2.The opening ceremony is a great occasion.It is essential__for it.
A. for us to be prepared B. that we are prepared
C. of us to be prepared D. our being prepared
希望大家给予详细解析!多谢各位!

Answer 1

1.B
翻译：农业是该国的主要经济来源，到目前为止小麦是规模最大的谷类作物
同样是独立主格，补充说明背景。“小麦”和be之间是主动关系，所以用现在分词

2.B
虚拟语气
It is ... that + 一般现在时
或者It is ... that + sb. (should) do ...

希望满意！

Answer 2

1 B， wheat is by far the biggest，但由于这句是从句，要用be的ing形式
2 A，it is ... to句型，前面的it是形式主语，to引导的不定式是实际主语，先排除B和D；for us to是固定搭配