单项选择题

It didn't seem to have ______ to her that once she was addicted to drug smoking, she could hardly give it up. But it did happen.

A．happened
B．took place
C．occurred
D．came about
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单项选择题
The students take a ______ test in March, and the main exam is in July.
A．previous
B．preliminary
C．preceded
D．elementary
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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