题目内容

I ____ to see a film every week.

A. go
B. going
C. goes
D. gone

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Mary likes going____ .

A. on shop
B. to shop
C. shop
D. shopping

What are you going _____ this weekend?

A. doing
B. did
C. to do
D. do

We go____every year.B. camp B. camps C. camping D. camper

1、比较层次分析方法，理想解法和数据包络分析方法，阐述三种方法优缺点？