单项选择题

You'd better ______ the same things all the time.
A) not to eat C) don't eat
B) not eating D) not eat
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单项选择题
My key was missing, I ______ it in the office. A) should have left C) must have left B) could have left D) need have left
My key was missing, I ______ it in the office.
A) should have left C) must have left
B) could have left D) need have left
单项选择题
So far every means ______ tried, but we still haven't found anything helpful to the case. A) has been C) are B) is D) have been
So far every means ______ tried, but we still haven't found anything helpful to the case.
A) has been C) are
B) is D) have been
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