题目内容
There is no doubt that hiking is good for the retired couple, but it remains ________ whether they will enjoy it.
[ ]
A.
to see
B.
seeing
C.
to be seen
D.
seen
答案:C
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题目内容
There is no doubt that hiking is good for the retired couple, but it remains ________ whether they will enjoy it.
to see
seeing
to be seen
seen