【題目】Please turn off the radio! I __________over some difficult maths problems.

A. thinkB. have thoughtC. am thinkingD. will think

【答案】C

【解析】

句意：請關(guān)掉收音機(jī)！我正在想一些難的數(shù)學(xué)題。考查時態(tài)。A. think一般現(xiàn)在時；B. have thought現(xiàn)在完成時；C. am thinking現(xiàn)在進(jìn)行時；D. will think一般將來時。根據(jù)句意請求別人關(guān)了收音機(jī)，所以應(yīng)是現(xiàn)在需要思考問題。故選C。

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