【单选题】【消耗次数：1】
I don’ t think it’ s important, _____?
①
doesn’ t
②
is it
③
do I
④
isn’ t
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—Look, someone is coming. Guess who it ___ be?—I think it ___ be Tom.—I don’t think it ___ be ___.
①
?must; can; must; his
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随机题目
【多选题】
胰液中的蛋白水解酶初分泌时以酶原形式存在的主要意义是
①
抑制蛋白酶的分泌
②
促进蛋白酶的分泌
③
维持胰蛋白酶的分泌速度
④
保护胰腺组织不被自身消化
⑤
保证蛋白酶在特定部位发挥消化作用