It was very kind ________ to invite us to go for a picnic on Sunday.
A.to them
B.for them
C.of them
D.of their
答案 :
C
We all think ________ our duty ________ tidy the lab after the experiment.
A.that
B. to
C.which
D. for
E.it
F. to
G.this
H. to
答案 :
C
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