单项选择题

Animal mothers are devoted to their young and ________ them with love and discipline.

A．mind
B．watch
C．help
D．tend
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单项选择题
I meant ________ you about it, but I forgot to do so.
A．telling
B．having told
C．to tell
D．to have told
单项选择题
While doing calculation for the project, the designers ________ a new solution to a geological problem.
A．fell into
B．stumbled upon
C．set out
D．discovered
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