- Did you get a dictionary?

　　- No, I _____, but there were not any _____.

A．tried; to be left

B．had tried to; leaving

C．tried to; left

D．had tried; have left

他人在场，会影响助人行为。一般情况下，在场人数越多，助人行为（）。

A.越少

B.越难预测

C.越多

D.越迅速增加