He walked down the hills, softly to himself. A.sing B.singing C.sung D.to sing——青夏教育精英家教网—

摘要：He walked down the hills, softly to himself. A.sing B.singing C.sung D.to sing

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He walked down the hills, softly to himself.

A. sing B. singing C. sung D. to sing

.He walked down the hills, _______ softly to himself.

A．sing　　

B．singing　　

C．sung　　

D．to sing

.He walked down the hills, _______ softly to himself.

.He walked down the hills, _______ softly to himself.

　A. sing　　 B. singing　　 C. sung　　 D. to sing

.He walked down the hills, _______ softly to himself.

　A. sing　　 B. singing　　 C. sung　　 D. to sing

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