题目

. _______ late in the afternoon, Bob turned off the alarm. A. To sleep     B. Sleeping            C. Sleep           D. Having slept 答案：A（2009•临沂）若x＞y，则下列式子错误的是（ ）A．x-3＞y-3B．3-x＞3-yC．x+3＞y+2D．