—Did Jack come back early last night?—Yes,it was not yet eight o’clock_______he arrived home.
#72308
A
why
B
when
C
that
D
which
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I have two grammars, ______are of great use. 
#73806
A
all of which
B
either of which
C
both of that
D
both of which
 It was quite a serious accident, _____ caused by careless driving.
#72311
A
which I think was
B
I think which was
C
which I think it was
D
I think which it was