Schools don't allow _____answers in the

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问题选择题

Schools don't allow _____ answers in the exam.

A. copy
B. to copy
C. copying
D. copied

答案

答案：C

选择题

—Hurry up! Alice and Sue are waiting for you at the school gate.

—Oh! I thought they________ without me.

A．went

B．are going

C．have gone

D．had gone

问答题简答题

肺泡表面活性物质的主要化学成分是什么？有何重要生理功能？