（2015陕西）Mary _________ really hard on his book and thinks he'll have finished it by Friday.

题型：单选题题类：真题难易度：普通

Mary _________ really hard on his book and thinks he'll have finished it by Friday.

A、worked B、has been working C、 had worked D、has worked

举一反三

—The new Star Wars. We here for more than two hours.

—He went to the library after breakfast and {#blank#}1{#/blank#} (write) his essay there ever since.

—No wonder. You {#blank#}1{#/blank#} (work) in front of that computer too long.

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