单项选择题

Please remain （） until the plane has come to a complete stop.

A. to seat
B. to be seated
C. seating
D. seated

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His children are well-behaved, （） those of his sister’s are very naughty.

A. and
B. so
C. thus
D. while
单项选择题
The news has spread all over the country （） the spaceship succeeded in returning to the earth.

A. what
B. that
C. which
D. whether
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