问题补充:
It is said that nobody in the world can lift a subject which is himself.
A. the tree times weight of
B. three times the weight of
C. as three times as heavy as
D. three times as heavier as
答案:
A. the tree times weight of
(答案→)B. three times the weight of
C. as three times as heavy as
D. three times as heavier as
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