问题
选择题
Little Jim sat under the tree, ___ about that maths problem.
A．to think
B．and thinks
C．thought
D．thinking
答案
答案：D
搜题请搜索小程序“爱下问搜题”
Little Jim sat under the tree, ___ about that maths problem.
A．to think
B．and thinks
C．thought
D．thinking
答案：D
