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1 . According to some experts, the 24 solar terms were used for the first time in books during the Western Han Dynasty, __________ the Start of Spring was set as the Spring Festival.
A.where | B.when | C.that | D.which |
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2 . We will postpone the picnic in the park until next week, the weather may be better.
A.where | B.when | C.which | D.that |
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