问题
Theresearchersfoundclearandconvincingevidence_________happinessisthekeywhenitcomestobetterhealthandlongerlives.[ ]
A:where
B:whether
C:how
D:that
B:whether
C:how
D:that
正确答案是：
同类题型
_____ my finishing reading the novel, you shall have it immediately
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