(2013·高考陕西卷)The children lost in the woods；otherwise，they would have been at the lakeside camp as scheduled.
A. must have got
B. must get
C. should have got
D. should get
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(答案→)A. must have got
B. must get
C. should have got
D. should get
解析：选A。题干的意思是：“孩子们一定是在森林中迷路了；否则的话他们会按计划在湖边露营的。”从题干中的otherwise后面表达的情况来看，前半句应该是表示对过去的肯定推测，所以要用must have done结构，意为“一定/想必已经……”。