單項(xiàng)選擇題They（）each other for more than twenty years.
A.don't see
B.didn't see
C.haven't seen
D.hadn't seen
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1.單項(xiàng)選擇題These desks and chairs（）to the children in the mountain villages next week.
A.are sent
B.will send
C.have sent
D.will be sent
2.單項(xiàng)選擇題Therefore, other things（）equal, the number of workers that employers want decreases.
A.is
B.are
C.being
D.having
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