皮皮学，免费搜题
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【单选题】
Speaker A: __________________ Speaker B: We have English, math and skill training classes.A.
What subjects do you have?
B.
How many classes do you have?
C.
What classes do you like?
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【单选题】Not until he left his home _____ to know how important the family was for him. [ ]
A.
did he begin
B.
had he began
C.
he began
D.
he had begun
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