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【简答题】
When they arrived in the Soviet Union, the Americans were glad that they had prepared themselves to experience life under communism.
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皮皮学刷刷变学霸
举一反三
【单选题】There are some boys______soccer on the playground. [ ]
A.
play
B.
to play
C.
playing
D.
are playing
【单选题】There are some boys ________ in the river.
A.
swimming
B.
to swim
C.
are swimming
D.
is swimming
【简答题】（）型谈判者把对方不当作敌人，而看作朋友。
【简答题】流体在管道中有两种流动状态,熔融塑料在浇注系统流动中应为 状态,而冷却水在冷却管道中应为 状态。