问题：
—Where is Jack?
—He ______ London. He ______ there twice before.
[ ]
A. has been to; has gone to
B. has gone to; has been to
C. has been to; has gone
D. has gone to; has been
—Where is Jack?
—He ______ London. He ______ there twice before.
B. has gone to; has been to
C. has been to; has gone
D. has gone to; has been
—He ______ London. He ______ there twice before.
[ ]
A. has been to; has gone to B. has gone to; has been to
C. has been to; has gone
D. has gone to; has been
参考答案：