He visited three cities when he stayed in the U．S．, New York, Washington and Hou
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He visited three cities when he stayed in the U．S．, ________ New York, Washington and Houston．
A.such as
B.they are
C.which is
D.that is
试题答案
D
such as列举同类中的部分例子，如果列举前面的全部内容，则要用that is或namely。