题目内容

Living in westen part of the country has its problem, _______ obtaining fresh water is not the least.

A. with which
B. of which
C. which
D. for which

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Although he knew little about the large amount of work done in the field, he succeeded _______ other more well-informed experiments failed.

A. which
B. that
C. what
D. where

The professor could hardly find sufficient grounds______ his arguments in favour of the new theory.

A. onwhich base
B. which to base on
C. to base on
D. to be based on

Govenment reports, examination compositions, legal documents and most business letters are main situations_______ formal language is used.

A. in which
B. at which
C. on which
D. in that

The course normally attacts 20 students per year, ______ up to half will be from overseas.

A. in which
B. for whom
C. with which
D. of whom

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