单选题
______ Mrs. Lee was calling her husband's office, he was calling hers.
A、
(A) While
B、
(B) Because
C、
(C) So
D、
(D) Then
【正确答案】
A
【答案解析】
While expresses the idea of during. Choices (B), (C), and (D) all show cause and effect.
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