You may imagine what great difficulty I had plicated ideas in simple English.
A. expressing
B. to express
C. expressed
D. express
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(答案→)A. expressing
B. to express
C. expressed
D. express
解析：句意：你可以想象我用简单的英语表达这里复杂的想法是多么困难。这里使用了词组：have difficulty （in） doing做…有困难。这里省略了介词in，所以后面接动名词，选A。