问题
选择题
It’s hard to finish the work in a day. You’d better ____ your friends to help you.
A.call for
B.call on
C.call at
D.call up
答案
答案:B
It’s hard to finish the work in a day. You’d better ____ your friends to help you.
A.call for
B.call on
C.call at
D.call up
答案:B