【題目】I ________ be a doctor when I grow up, but I'm not sure.

A. must B. could C. can D. can't

【答案】B

【解析】句意:我長(zhǎng)大了可以當(dāng)一名醫(yī)生,但我不確定?疾榍閼B(tài)動(dòng)詞。A. must一定; B. could可能;C. can能;D. can't不可能,不可以。Can’t表示否定推測(cè),表示肯推測(cè):must(一定,可能性很大),could(可能,不確定);結(jié)合句意和語(yǔ)境可知選B。

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