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In the dark street, there wasn’t a single person ______ he could turn for help.

      A. that              B. who                    C. from whom             D. to whom

In the dark street, there wasn’t a single person ______ he could turn for help．

A．that　　 　　 B．who　　 　　 C．from whom　　　 D．to whom

In the dark street, there wasn't a single person ________ he could turn for help.

[　　]

In the dark street, there wasn't a single person ________ he could turn for help.

[　　]