单项选择题

Digging the garden with a spade is a very ()task. I am exhausted after such two-hour's work.

A. industrious
B. manual

C. conscientious
D. laborious

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单项选择题
If you plant two apple trees in one square yard of land, and the trees' productivity () decline.

A. is bound to
B. is determined to
C. is unlikely to
D. is related to
单项选择题
Some people () in part the defeat of the revolution in France and Germany to the English diplomacy, do you agree

A. contributed
B. attributed
C. distributed
D. owned
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