In the past decades, sea ice [u] [/u] in the Arctic as a result of global warming.
未知类型：{'label': 'questionDesc', 'content': '请选择正确答案。', 'isMemberControl': 0, 'type': 181}
A: had melted
B: has been melting
C: melted
D: is melting
未知类型：{'label': 'questionDesc', 'content': '请选择正确答案。', 'isMemberControl': 0, 'type': 181}
A: had melted
B: has been melting
C: melted
D: is melting
举一反三
- Over the past decades, sea ice _____ in the Arctic as a result of global warming.
- The match has been [u] [/u]. A: postponed B: agreed C: advised 未知类型：{'label': 'questionDesc', 'content': '请选择正确答案', 'isMemberControl': 0, 'type': 181}
- There has been some [u] [/u] in unemployment. 未知类型：{'label': 'questionDesc', 'content': '请选择正确答案', 'isMemberControl': 0, 'type': 181} A: recognize B: reduction C: proper
- He has been[u] [/u]honest man in his life. 未知类型：{'label': 'questionDesc', 'content': '请选择正确答案。', 'isMemberControl': 0, 'type': 181} A: a B: an C: the D: /
- He has long been out of [u] [/u] on the violin. A: practice B: order C: stock 未知类型：{'label': 'questionDesc', 'content': '请选择正确答案', 'isMemberControl': 0, 'type': 181}