During Dr Mar's last visit, he ________ on 150 patients on the ORBIS plane.
| A． |
operates |
B． |
is operating |
C． |
will operate |
D． |
operated |
During Dr Mar's last visit, he ________ on 150 patients on the ORBIS plane.
| A． |
operates |
B． |
is operating |
C． |
will operate |
D． |
operated |
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