单选题
We have decided to call ______ Mr. Black sometime next week at his home.
A、
on
B、
at
C、
up
D、
for
【正确答案】
A
【答案解析】
call on号召,访问;call at访问,停靠,后面接物,如place,house等;call up召唤,打电话;call for提倡,为……叫喊。
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