填空题

It is necessary that the students ____________ (做更多练习).

【参考答案】

(should) have more exercises to do
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单项选择题
A．inB．toC．forD．at
A．in
B．to
C．for
D．at
填空题
The magician picked several persons ____________ (任意地) from the audience and asked them to help him with the performance.
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