A、which
B、that
C、where
第4题
A、useful
B、useless
C、usefulness
第5题
A、so
B、when
C、because
第6题
A、plan
B、planning
C、planned
第7题
A、for which
B、of that
C、for that
D、of which
第8题
A、 which they ask for
B、 for which they ask
C、 for which they ask for
D、 which they ask
第9题
A、from which
B、which
C、and
D、of
第10题
A、that
B、which
C、who
D、of which
第11题
A、 which;which
B、 that;that
C、 which;that
D、 that; which