题目内容

Some reseaarchers believe that there is no doubt ___________ a cure for AIDS will be found.

A. which
B. that
C. what
D. whether

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A. if
B. when
C. that
D. which

A. why
B. that
C. where
D. because

A. where
B. there
C. there where
D. where there

A. Because his mother is ill
Because of his mother’s being ill
C. that his mother is ill
D. for his mother is ill