答案:A
Entering the room, I found Mary _______ at the desk and _______ a letter.
A.seated; wrote
B.sitting; written
C.seating; writing
D.seated; writing
为了能改变机动车的行驶速度,()是传动系不可缺少的部分。
A.转向器
B.变速器
C.制动器
D.方向盘