下列各组溶液，不需另加试剂就可一一鉴别出来的是（　　）

A．BaCl₂、HCl、Na₂CO₃

B．KCl、HCl、AgNO₃

C．NaOH、NaCl、CuCl₂

D．K₂SO₄、BaCl₂、HNO₃

Every time _____ he thought of his past, he couldn't help bursting _____.[ ]

A. when; out tears

B. that; into crying

C. which; into cry

D. /; out crying