单选题
The supervisor didn't have time so far to go into it____________, but he gave us idea about his plan.
A、
at hand
B、
in turn
C、
in conclusion
D、
at length
【正确答案】
D
【答案解析】
at length“详细地，充分地”。A．at hand是“在手头；即将来临”；B．in turn是“依次，轮流”；C．in conclusion是“最后，结论”。
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