学生们原定在9点前交论文，但很多人申请了延期。
The students were due to submit their papers by 9, but many asked for an extension.
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were英 /wɜː/|美 /wər/
due英 /djuː/|美 /du/
to英 /tuː/|美 /tu/|英 /tə/|美 /tə/
submit英 /səbˈmɪt/|美 /səbˈmɪt/
解释
were due to submit：过去式 were 加 due to 后接动词原形 submit，表示「原定在9点前提交」，复数主语 students 用 were。
The students were due to submit their papers by 9, but many asked for an extension.
were due to submit：过去式 were 加 due to 后接动词原形 submit，表示「原定在9点前提交」，复数主语 students 用 were。