16、--- How long do you suppose it is         the secretary arrived here?

--- Not more than half an hour, I’m afraid.

A．until                           B．before                 C．when                  D．since

16、D

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--- How long do you suppose it is         the secretary arrived here?

--- Not more than half an hour, I’m afraid.

A．until                           B．before                 C．when                  D．since

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