摘要：34．- Do you know mother giant pandas have only one or two babies ? - Sorry, I don’t know. A. at a time B. at the time C. at this time D. at that time
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---Do you know mother giant pandas have only one or two babies ?
----Sorry，I don’t know．
A．at a time B．at time C．at times D．at that times
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---Do you know mother giant pandas have only one or two babies ?
----Sorry，I don’t know．
----Sorry，I don’t know．
| A．at a time | B．at time | C．at times | D．at that times |