根据马克思主义的基本观点,人类历史的发展经历了原始社会、奴隶社会、封建社会、资本主义社会、新民主主义社会、社会主义社会六种基本的社会形态。()
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This is my pen, _____that is your pencil.
A. in
B. of
C. and
D. but
I love ice-cream,______ I can't eat too much, because I don't want to be fat.
A. and
B. but
C. or
D. so
She doesn't send emails _____watch movies on computer.
A. and
B. or
C. so
D. but
There are no buses, ______you'll have to walk.
A. so
B. or
C. but
D. for