單項選擇題

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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單項選擇題

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

單項選擇題

Therefore, other things（）equal, the number of workers that employers want decreases.

A.is
B.are
C.being
D.having