题目内容

Hospitality can be defined, in some sense, as the host's ability to _________their guests and make them feel at home.

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In China, people often feel_________to invite you to their weddings if you have invited them to yours earlier.

When invited to a friend's home in America, you are expected to inform the host in advance in case of the ______in your arrival.

1.Not until we had reached the mountain top____how high we had climbed.

A) did we realize
B) we did realize
C) do we realize
D) we realize

2.The doctor told us it was a robot_____performed the surgery.

A) whom
B) that
C) which
D) what

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