未知题型
-Hello, may I talk to John please? -( ).Sorry, he is busy at the momentB: No, you can'tC: Sorry, you can'tD: I don't know
A
未知题型 He is always getting ( )me for minor mistakes.forB: atC: awayD: over
单项选择题 打开过的无菌包若未受污染有效时间为：
未知题型 Because the twins are identical, it is impossible to tell ( ).which one from the otherB: one from the otherC: one from which otherD: one and the other
