【題目】Students _________ be careful when they do chemical experiments in the lab.

A. can B. may C. need D. must

【答案】D

【解析】

句意:學(xué)生在實(shí)驗(yàn)室做化學(xué)實(shí)驗(yàn)時必須小心?疾榍閼B(tài)動詞。A. can能、會;B. may可以;C. need需要;D. must必須。根據(jù)后半句when they do chemical experiments in the lab.“當(dāng)他們在實(shí)驗(yàn)室做化學(xué)實(shí)驗(yàn)時”,可知前半句的句意為“學(xué)生們必須小心”,故答案選D。

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