A. are droppedB. dropC. are being droppedD. have droppe……

单项选择题You ()buy a gift, but you can if you want to.

A. must

B. mustn't
C. have to
D. don't have to

单项选择题The farmers stored up a good()of wheat and a () of beans this year.

A. number; lot
B. deal; number
C. plenty ; lots
D. deal; lots

单项选择题学习档案是以个人的方式经过长期的、有目的、有计划地对自己学习过程和成果的信息、资料累积起来的集聚物，“学习档案袋”是______的一种典型方式。

单项选择题For many years, people () electric cars. However, making them has been more difficult that predicted.

A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of

单项选择题根据《水浒传》的描述，在头脑中再造出武松打虎的情景的过程，就属于( )。

单项选择题—I'm going to study engineering in Tsinghua University tomorrow. —______.