题目内容


During the dialogue with Chinese youth in Shanghai, President Obama announced the U.S. would expand the number of students to study in China to 100,000 _______ ties between the two countries.
A．strengtheningB．strengthenedC．to strengthen D．to be strengthened
C
表示做某事的目的用动词不定式to do，strengthen为加强的意思，故本题选C。
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