He kept constant contact with his family while he was in Australia.

2023-07-03

A:gradual
B:regular
C:direct
D:occasional

参考答案:B

本句意思:在澳大利亚时他经常与家人联系。单词regular意思为“有规律的”,与con- stant(持续的)意思接近。单词gradual意思为“逐渐的,逐步的”;direct意思为“直接的”;occa- sional意思为“偶然的”。