Though he is busy, he is very and makes a telephone call to his parents from time to time and tries his best to spare some time to visit them.
A. constant
B. considerate
C. considerable
D. conscious.
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A. constant
(答案→)B. considerate
C. considerable
D. conscious.
解析：词义辨析。 A. 不变的 B. 考虑周到的 C. 值得考虑的 D.自觉的。句意：尽管他很忙，他考虑的也非常周到，不时打个电话给他的父母……故选B.