单项选择题

The bold word" it" refers to which of the following

A．Problem.
B．Material.
C．Difficulty,
D．System.
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单项选择题
A．to contractB．being contractedC．contractingD．contract
A．to contract
B．being contracted
C．contracting
D．contract
单项选择题
A．call onB．call forC．call inD．call forth
A．call on
B．call for
C．call in
D．call forth
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