问题
选择题
27. Now and then they would ______ our house and have a talk with us.
A．call on
B．drop in at
C．drop in on
D．drop in
答案
答案：B
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27. Now and then they would ______ our house and have a talk with us.
A．call on
B．drop in at
C．drop in on
D．drop in
答案：B