【題目】My best friend has trouble with his science and he is worried at the moment.

A. now B. at times

C. in a minute D. usually

【答案】A

【解析】

試題分析：句意：我最好的朋友在科學上有困難，現(xiàn)在他很擔心。 A. now 現(xiàn)在；B. at times 有時；C. in a minute 立刻；D. Usually通常；故選擇A。

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