问题
选择题
They ______ the train to Beijing．Otherwise, they would have returned home．
A．need have caught
B．must have caught
C．must catch
D．may catch
答案
答案：B
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They ______ the train to Beijing．Otherwise, they would have returned home．
A．need have caught
B．must have caught
C．must catch
D．may catch
答案：B