10春学期《大学英语(四)》在线作业1-3

百分百学习网

10春学期《大学英语(四)》在线作业一
试卷总分：100       测试时间：--

0 N6 H4 a' e9 a# _8 j
: s" l6 d; ~8 a- H- d" S
$ i/ s' j$ t( J- V/ G# y( H# _5 i4 {  _一、单选题（共 20 道试题，共 100 分。）V
- Q5 @4 \8 ?9 A! \5 C( v 1.  17. We have not seen our next-door neighbors for weeks. They __D____ somewhere for holiday.
0 z0 O, @) U. e& e3 R! H5 m7 z: UA. should have gone
* d8 {! E9 }+ ]" h' `, }9 }B. need have gone
C. ought to have gone
# Z/ y! A8 c6 RD. must have gone
3 B: o* _- ^+ |  ^+ P) Q* o      满分：5  分