题目

I am really proud of my group _______ we're always discussing and sharing study secrets together．How important the group work is! A．because    B．though   C．unless 答案：AAre you worried ________ your son, Mr. Green? Yes. He is weak in Chinese. A. of　　　　　　　　　　 B. for C. with　　　　　　　　  D. about