单选题：I had some difficulty in carrying out the plan.（　　）

题目内容：

I had some difficulty in carrying out the plan.（　　） A．making
B．keeping
C．changing
D．implementing

参考答案：

答案解析：

I am not certain whether he will come.（　　）

I am not certain whether he will come.（　　）A．determined B．sure C．sorry D．glad

分类：综合类题型：单选题

It took us a long time to mend the house（　　）A．build B．destroy C．design D．repair

分类：综合类题型：单选题

When the levels of cortisol go high，the hippocampusA．may expan B．may shrin C．may

分类：综合类题型：单选题

The animals in Australia are vastly different from those in Europe．A．chiefly B．g

分类：综合类题型：单选题

The international students in the US work harder than the American students．A．Ri

分类：综合类题型：单选题