{01}. ____________ the dinosaurs disappea red still remains a mystery.
A.whether
B.that
C.if
D.Why
解析:略 本题选D。 {02}_______ Lucy were not given timely treatment, she would suffer from a cough for the rest of her life shocked her parents.
A.That
B.If
C.That if
D.If that
解析:if 从句做主语,不少成分用that, that不可省。整个句子的谓语为shocked 本题选C。 {03}—Have you finished the book? ---No,I’ve read up to_________the children discover the secret cave.
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