10春学期《大学英语(四)》在线作业1-3

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10春学期《大学英语(四)》在线作业一
3 _: A+ \) v" d! K! y试卷总分：100       测试时间：--
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一、单选题（共 20 道试题，共 100 分。）V
1.  17. We have not seen our next-door neighbors for weeks. They __D____ somewhere for holiday.
A. should have gone
" E6 e0 J/ o2 |) @$ j7 [B. need have gone
# I! E4 h( U5 n% R7 T# M, d6 y) WC. ought to have gone
D. must have gone
: T& P( Q/ W+ i      满分：5  分