题目

—Have you thought of the topic for the composition? — Not yet．I _____ it very carefully, but I haven’t decided．      A．will consider                     B．have been considering                 C．had considered            D．was considering 答案：B 解析: 考查动词时态。由Not yet．以及 but I haven’t decided．可知，是一直在考虑，所以用现在完成进行时，表示一直在做这件事。

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