摘要： Alison

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Alison has been skating ________ four hours.

A.
since
B.
about
C.
for about
D.
for since

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Alison has been sleeping ________ eight o'clock yesterday evening.

A.
for
B.
since
C.
at
D.
until

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Alison has been skating for ________ two hours.

A.
the all
B.
whole the
C.
the whole
D.
all of

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Alison ________ for the whole five hours.

A.
skated
B.
skates
C.
have been skating
D.
has been skating

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Alison has been sleeping ______ eight o'clock yesterday evening.

A. for
B. since
C. at
D. until

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