问题
选择题
She has much difficulty science, so the often asks me for help.
A．understand
B．understood
C．understands
D．understanding
答案
答案：D
题目分析：句意：她在理解科学上有困难，所以她经常向我请求帮助。have much difficulty doing sth在做……时有困难。故选D。
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