110.
(A) what
(B) when
(C) whether
(D) how

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統計： A(12), B(22), C(13), D(60), E(0) #1593180

詳解 (共 2 筆)

#2673476
It wasn’t until then...
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#3709974

One day, it 109 him that using silver銀's weak glue on a piece of paper might help him mark the right page without damaging the book.

It wasn’t until then did the two inventors find out 110 to deal with the weak glue, and the Post-it note quickly sold like hot cakes around the world.

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