单项选择题

The () of trade with foreign countries are gradually changing as China's industry develops.

A．shapes
B．chances
C．masons
D．patterns

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Ever since he () his job, Allen has been much happier than before.

A．has changed
B．had changed
C．changed
D．changes
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My former school is now very different from () it was when I was there.

A．what
B．where
C．that
D．which
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