Question

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想請教第二題為什麼不能選where
第四題不能選when？
謝謝

2. This is the museum
a. which
b. in which
c. where
d. in where
: in which
the recently found artifact will first be displayed to the public.

4.40 Spring and autumn are the seasons
a. when
b. at which
c. in which
d. which
in which
Susan feels the most comfortable because the weather is not too hot and not too cold.

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