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

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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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—HasTomfinishedhisexperimenttoday?—Noidea.He________itthismorning.A、i