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    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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