题目内容

Modern science has given clear evidence __________ smoking can lead to many diseases.

A. what
B. when
C. that
D. where

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__________ the English evening will be held has not yet been announced.

A. Where
B. Who
C. What
D. Whom

It's strange __________ there are no lights on.

A. who
B. that
C. where
D. whoever

She will give __________ needs help a warm support.

A. whoever
B. wherever
C. whenever
D. however

__________ this is true or not, I really don't know.

A. If
B. Whether
C. How
D. When

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