Without that temporary working-site, the student __________(不可能按时完成设计).couldn’t

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问题 Without that temporary working-site, the student __________(不可能按时完成设计).

选项

答案 couldn’t have finished the design on schedule/on time

解析两个考查点：① without后接条件，表示假设没有该条件，是一种对过去情况的虚拟语气，主句谓语用 couldn’t have done。② 短语表达“按时”为on schedule/on time。

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