单项选择题

Fossil records indicate ______ existing in the past have become extinct.

A. that many species of organisms
B. many species of organisms that
C. many species of organisms are
D. there are many organisms
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单项选择题
I only got round to （）this a few days ago.

A. do
B. doing
C. having done
D. have done
单项选择题
Rights exist only within a social contract, as part of an exchange of duties and entitlements. The italicized part is used to modify （）

A. the object
B. the verb
C. the subject
D. the prepositional phrase
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