A、<p><span style="font-size: 10.5pt; font-family: 宋体;">丙与丁应向甲承担违约责任</span></p>
B、<p><span style="font-family: 宋体; font-size: 14px; ">丙应向乙承担违约责任</span></p>
C、<p><span style="font-family:宋体"><span style="font-size: 14px;">甲应向丁主张违约责任</span></span></p>
D、<p><span style="font-family:宋体"><span style="font-size: 14px;">丁应向乙承担违约责任</span></span></p>