问题：
[单选题]● The earned value technique is a commonly used method of performance measurement. It integrates project scope, cost, and schedule measures to help the project management team assess project performance. If a project’s Schedule Performance Index(SPI=EV/PV) value less than 1.0, it means that __(74)__.
A、（74）the project is ahead of its planned schedule
B、less work was completed than was planned
C、the cost overrun for work completed
D、the cost under-run of performance to date
参考答案：
B
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