“虽有天下易生之物也，一日暴之，十日寒之，未有能生者也。”孟子是用反面事例来强调学习要（）

A.专心致志

B.磨练意志

C.持之以恒

D.深造自得

--How did you find the film yesterday evening?

--Just so so. It _______ pace.

A．lacked in

B．lacked

C．was lacking

D．was lacked in