—Has Tom finished his experiment today? —No idea. He________it this morning.

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问题 —Has Tom finished his experiment today?
—No idea. He________it this morning.

选项 A、is doing
B、was doing
C、had done
D、has done

答案B

解析 句意:——汤姆今天完成实验了吗?——不知道,他今天上午一直在做。本题考查的是时态的用法。根据题意,题目表达的是Tom今天上午一直在做,需用过去进行时,故B正确。
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