专四
单选题正确选项是（ ）。
A． While
B． when
C． if
D． as
参考答案：A进入在线模考
逻辑衔接题。句意同上题。由句意可知，两个分句为转折关系，四个选项中只有连词while可以表示转折，因此[A]while为答案。
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