问题
选择题
Our manager never fails to answer a phone call ______ she is very busy.
A．since
B．once
C．even if
D．so that
答案
C
题目分析：句意：即使我们的经理很忙她也从不会不接听电话。A.自从，既然；B.曾经，一旦；C.即使，纵然D.以至于。fail to do未做成；由题意知选C。
考点：
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