[ Grammar ]
Which sentence uses a comparative adjective correctly?
A. This espresso machine is more expensive than that one.
B. This espresso machine is expensiver than that one.
C. This espresso machine is the most expensive than that one.
D. This espresso machine is expensive than that one.

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B. Excited
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Kevin’s really smart; he ___ speak three languages by the time he was six.
A. must
B. had to
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