________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 |
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________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 |
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