—Have you thought of the topic for the composition?
— Not yet．I _____ it very carefully, but I haven’t decided．
A．will considerB．have been considering
C．had consideredD．was considering
B
考查動詞時態(tài)。由Not yet．以及 but I haven’t decided．可知，是一直在考慮，所以用現(xiàn)在完成進行時，表示一直在做這件事。
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