问题
选择题
________the American economy expanded at an annual rate of 2.5 percent in July—September, it faced a long road to recovery.
A．Since
B．If
C．While
D．When
答案
答案：C
考查状语从句。while用作连词，可引导让步状语从句，意为“虽然”，符合题意。
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