题目内容

I think the dog__________ killed last night.

A. must have been
B. should be
C. ought to
D. had

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The railway__________ now.

A. is built
B. being built
C. is building
D. is being built

It__________ about 20 years to build the pyramids.

A. has been taken
B. may have taken
C. has been taking
D. may take

The road__________ two years ago has been destroyed.

A. building
B. built
C. which built
D. was built

下面哪些是轻声的结构助词：（）

A. 来、去、上、下
B. 子、儿、头、们
C. 着、了、过
D. 的、地、得