Question

Dung is kind and helpful, but he is also a little careless _____________.

A．at time

B．at a time

C．at times

D．once a time

Answer 1

C

试题分析：句意：Dung好心肠并乐于助人，但是他有时也有些粗心。in time及时，迟早；on time准时；at a time曾经；at times有时，偶尔；once a time从前。根据句意选C。