问题
选择题
Richard was very strict with his two daughters,______them to compete against each other.
A．to train
B．trained
C．and trains
D．training
答案
答案：D
考查非谓语动词。句意：理查德对他的两个女儿非常严格，训练她们彼此竞争。现在分词表示主语正在进行的伴随性动作，和句子主语是主谓关系，结合语境可知选D。