单项选择题

The boy has been taking piano lessons from my neighbor （）he was 12.

A.ever since
B.ever when
C.from when
D.from since

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单项选择题

Something went wrong with my television last night.-（）。

A.It’s impossible.
B.I’m sorry to hear that.
C.How did you manage to do that？

单项选择题

Building that railway was very difficult and involved （）ten tunnels.

A.to have dug
B.digging
C.dig
D.having dug