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單項選擇題

On his back the man carried a heavy（）of old clothes.

A.bulk
B.bundle
C.stock
D.mass

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Only the most sophisticated theories of modern physics can（）this phenomenon.

A.account for
B.count on
C.account of
D.count for

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This is（）the most difficult job I have ever tackled.

A.by rights
B.by itself
C.by oneself
D.by far

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