Tom is tall, but his sisters, Mary and Kathy, short.A. are bothB. all areC. are allD. both

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(答案→)A. are both
B. all are
C. are all
D. both are
解析：根据英语中副词应放在助动词之后，实意动词之前的用法，可将BD排除；又根据前面的Mary and Kathy可知，应该是两者，故用both。所以本题选A。