The only existing problem is ____ we can find this special wood in the forest in such a short time.
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when
B
where
C
that
D
whether
推荐题目
Water，which seems so simple and common，is________makes life possible.
#79483
A
what
B
that
C
which
D
how
Although he has become wealthy, Mr. Wood remains ________ he used to be, modest and friendly.
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A
when
B
where
C
how
D
what
Water, which seems so simple and common, is ______ makes life possible.
#79418
A
what
B
that
C
which
D
how
Although he has become wealthy, Mr. Wood remains he used to be, modest and friendly.
#79447
A
which
B
where
C
what
D
that