单项选择题


A．to pay
B．paying
C．pay
D．to have paid
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单项选择题
A．is beingB．areC．have beenD．is
A．is being
B．are
C．have been
D．is
单项选择题
One explanation for the different character of English people is that ______.
A．they are geographically isolated from the European continent
B．they have nothing to do with the other Europeans
C．they like to keep quiet among their acquaintances
D．they tend to be reserved by nature
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