单项选择题

We were just ______ calling you up ______ you came in, ______ was unexpected.

A. about; when; that
B. on the point of; as; as
C. on the point of; when; which
D. on the point of; as; as
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______ you may be right, I can't altogether agree.
A. While
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C. if
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A. if
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C. since
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