There are no black rats in Europe today because ______ took their places.

A．He wants to check the order number.
B．He wants to order some computers.
C．He wants to report on a problem.
D．He wants to see the secretary.

A．6:00 p.m.
B．8:00 p.m.
C．9:00 p.m.
D．10:00p. m.