Grandmother always her children when she feels sad.
A. thinks over
B. thinks about
C. thinks of
D. thinks out
网友回答
A. thinks over
B. thinks about
(答案→)C. thinks of
D. thinks out
解析：think over仔细考虑；think about考虑，思考；think of记起，想起；think out解决，发现。句意：当她伤心时，奶奶总是想起她的孩子们。故选C。