单选题____AthatBsinceCwhenDwhere
单选题
____
A
that
B
since
C
when
D
where
参考解析
解析：
由空格前的“when you are working hard”，以及表并列的连词“and”可知，所对应的关联词是“when”。
由空格前的“when you are working hard”，以及表并列的连词“and”可知，所对应的关联词是“when”。
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