问题

It is human nature to thinkback to a golden age ____one’s country was strong and respected[ ]

A: if
B: when
C: while
D: after

正确答案是：

同类题型

Nowadays many animals are facing danger. Such situation won’t change _____ humans stop hunting them.

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He felt even_______ when_______ he failed the Math exam again.

been thecomputer for two hours, chatting with a boy from Australia

It is obvious that John is unhappy_________, it comes as no surprise that she has decided to change her job