4 You will succeed in the end ____ you give up halfway. 
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A
even if
B
as though
C
as long as
D
unless
推荐题目
Our class is made up of 54 students, _____ are girls.
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A
of which two-fifths
B
of whom two-fifths
C
two-fifth of which
D
two-fifth of whom
The days ____we spent together on the farm are not easy ______.
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A
when,toforget
B
which, to be forgotten
C
that, to forget
D
/,to be forgotten