单项选择题

If the letter (to be mailed) was placed on the (writing) table an hour (ago), it is certain (will be) there now.

A．to be mailed
B．writing
C．ago
D．will be
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单项选择题
(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioactive carbon (present) in the object (is examined).
A．The age of
B．be estimated
C．present
D．is examined
单项选择题
Years after the accident he was still ______ by images of death and destruction.
A．twisted
B．haunted
C．dipped
D．submerged
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