What should he ( )to learn English well?(用do填空)

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What should he ( )to learn English well?(用do填空)

What should he ( )to learn English well?(用do填空)
What should he ( )to learn English well?(用do填空)

What should he ( )to learn English well?(用do填空)
do
因为should是情态动词.后面加动词原形

do,should是情态动词

用原形do ,因为情态动词后跟动词原形

前面有了情态动词should,后面就要用动词的原形。填do 。