When it comes to____his classmates with the homework, he never feels tired.
A．helpB．helpingC．give helpD．offer help
B
考察詞組用法，此處to是介詞，后面要跟doing形式，
句意為，當(dāng)涉及到幫助他的同學(xué)做作業(yè)，他從來(lái)不感到累
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