Out math teacher set such a hard test problem ______ none of us could work out the other day.A that B as C what D so如何选及理由?

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Out math teacher set such a hard test problem ______ none of us could work out the other day.
A that B as C what D so
如何选及理由?

肯定选A thatsuch …… that 太难了,以至于做不出