单选题：__________thattheyfulfilledtheplanaheadofschedule.

题目内容：

__________thattheyfulfilledtheplanaheadofschedule. A．Sofasttheyworked
B．Sofastdidtheywork
C．Becausetheyworkedsofast
D．Sotheyworkedfast

参考答案：

答案解析：

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