问题补充：
The plan was so shallow and impractical that no serious was ever made to realize it.
A. recognition
B. comment
C. attempt
D. credit
答案：
A. recognition
B. comment
(答案→)C. attempt
D. credit
解析：句意：不过这项计划是如此肤浅和不切实际，以至于没有人会认真尝试来实现它。
recognition识别； comment评论； attempt试图，尝试； credit信用。根据句意故选C。
