问答题

The alarm clock didnt ring this morning. You______it last night.
A．need to have forgotten to wind
B．may have forgotten winding
C．ought to have forgotten to wind
D．must have forgotten to wind

A.
A．need
B.may
C.ought
D.must

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As always, the downtown area was the busiest with people______in theatres, restaurants and department stores.
A．crowded
B．crowd
C．being crowded
D．crowding

A.
A．crowded
B．crowd
C．being
B.crowding

______his number for an hour only to hear a busy signal, she became impatient and called the operator for assistance.
A．Dialing
B．Dialed
C．Having dialed
D．To dial

A.
A．Dialing
B．Dialed
C．Having
B.To