单项选择题

A．discouraging
B．encouraging
C．surprising
D．interesting
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单项选择题
A．face-to-faceB．hand-in-handC．neck-and-neckD．step-by-step
A．face-to-face
B．hand-in-hand
C．neck-and-neck
D．step-by-step
单项选择题
A．came backB．came onC．waved backD．waved on
A．came back
B．came on
C．waved back
D．waved on
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