单项选择题

His homework ______, John went back home.

A．having finished
B．finishing
C．had been finished
D．having been finished
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单项选择题
English words are not always spelt ______.
A．as the way they sound
B．the way that they sound
C．the way they sound
D．they sound
单项选择题
They left three hours ago; they ______ there by now.
A．must arrive
B．can arrive
C．must have arrived
D．will arrive
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