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 countriesA.strengtheningB.strengthenedC.to strengthenD.to be strengthened
网友回答
C解析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。