关于call的词组短语用法
call on sb.拜访某人,call at some place拜访某地,call up sb.给某人打电话.
[注意]drop to sb/ at + place 访问某人/ 某地.
1. I called his house, but he wasn’t in. Then I called him but I couldn’t get through, either.
A. at , on B. on; on C. at; up D. on; to
2. The other day Li Ming dropped in Li Fang her home.
A. at；on B. on；at C. but；at D. 不填； on
1-2解：CB.
3. The work a cot of time.
A. calls for B. calls on C. calls at D. calls up
解：选A. call for在此是“要求，需要”的意思.call on“号召，邀请，访问”，call up“给…打电话”，call at“拜访（某地）”. 
