单项选择题

The 850 British Airways () flew from Houston to London at its usual time.

A.fly
B.aircraft
C.plane
D.flight

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You're always late. You () late three times this week.

A.are being
B.were
C.had been
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The more slowly you speak, the () it is for us to understand.

A.easy
B.easier
C.easily
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