从价税
参考答案:
[背景材料]
[问题]
参加投标的甲、乙、丙、丁4家公司能否追究商贸公司的违约责任,为什么
David __ a stomachache, so he __ eat too much today.[ ]
A. has, should
B. has, shouldn’t
C. have, shouldn’t
D. have, should