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
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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