The book is optional. My professor said we ______ read it if we needed extra information for the essay. But we ______ read it if we don’t want to. A. will / cannot B. must / ought not C. c

The book is optional. My professor said we ______ read it if we needed extra information for the essay. But we ______ read it if we don’t want to.

A. will / cannot   
B. must / ought not
C. could / do not have to     
D. can / should not

Trả lời

Chọn đáp án C

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