American First Lady Michelle Obama arrived ______ China _______the afternoon of March 20, 2014.
| A．on, on | B．in, on | C．in, in | D．at, in |
American First Lady Michelle Obama arrived ______ China _______the afternoon of March 20, 2014.
| A．on, on | B．in, on | C．in, in | D．at, in |
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