单项选择题

Tom looked very much embarrassed when he was caught cheating in the exam（）the spot.

A、on
B、by
C、at
D、in

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The tree, the branches（）are almost bare, is a very old one.

A、whose
B、in which
C、of which
D、which
单项选择题
The reason（）I'm writing is to tell you about my experiment results.

A、because
B、as
C、why
D、for
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