单项选择题

Look at that little boy wandering about—perhaps he （）his mother.

A．will lose
B．is losing
C．had lost
D．has lost

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单项选择题
When I came back, I found my bicycle was （）.

A．missed
B．losing
C．robbed
D．gone
单项选择题
—I thought you wouldn't mind. —Well, as a matter of fact, I don't, but you （）me first.

A．should ask
B．should have asked
C．must ask
D．must have asked
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