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问题

It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it.

A:when; which
B:when; that
C:that; which
D:that; that
正确答案是:
同类题型

ite, who comes from____ European country,has formed the habit of attending _____church on Sundays.

You can, ________ the sky is clear, see as far as the old temple on top of the mountain, but not today.[ ]

If we can convince young people _____, they might then urge their parents and other people ____ smoking, too.

_______do you have an art festival in your school —Once a year.

Vera is ______ in English class. She puts up her hand every time her teacher asks a question.

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