---How long has this shop _____?
---For about three weeks.

A．opened B．been open 
C．been opened D．open 

B

解析試題分析：句意：這家商店開業(yè)多長時間了？大約三周了。how long 句子中不能用短暫性動詞open開業(yè)；been open表示是開業(yè)的狀態(tài)，可以持續(xù)。故選B。
考點：考查動詞時態(tài)。

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