单选题：Brain, like muscles, also needs some kind of exercise and nu..

_____ the rising rent prices in Wuhan can't compare with those in Beijing and Guangzhou, they still worry current college students.A. Even though B. As though C. In case D. As long as

短文改错。 Three young pioneers were playing while they saw a young tree bending to one side with some of it's leaves falling. They felt sadness and decided to save it. They put up a hard stick close by and tie the tree toit to make it straightly. Then th

He found it increasingly difficult, _____ his eyesight was beginning to fail.A. though B. forC. but D. so

My mother is a great cook and we ________ never get enough of her cookies.A．mayB．needC．should D．can

— Did you return Fred's call? — I didn't need to _____ I'll see him tomorrow.A. thoughB. unlessC. when D. because