单选题
Universities usually give diplomas or certificates to students who complete course requirements adequately.
【正确答案】
B
【答案解析】[解析] adequate：适当的、足够的，在含义上与suffcient(充分的、足够的)接近，因此它们的副词结构adequately和suffciently词义接近。responsibly：有责任地、可靠地；patiently：耐心地；successfully：成功地。