1、There is no doubt ________ Catherine is fond of dancing, for she always practices it on weekends
A.whether
B.if
C.that
D.which
2、If it ________ for his invitation the other day, I should not be here now
A.had not been
B.should not be
C.were not to be
D.should not have been
3、You have seen the girl ________ sister is a Chinese teacher
A.whom
B.of whom
C.whose
D.of which
4、He found it increasingly difficult to read, ________ his eyesight was beginning to fail
A.and
B.for
C.but
D.or
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