单项选择题

The director had her assistant () some hot dogs for the staff members.

A. picked up
B. picks up
C. pick up
D. picking up

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单项选择题
Only when you have a good knowledge of grammar () write correctly.

A. you will
B. you can
C. can you
D. can't you
单项选择题
There is no hurry. You can take your time ______ those exercises.
A. doing
B. to do
C. done
D. to be doing
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