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【单选题】
My grandma has kept her ______refrigerator for thirty years.A.
first large grey American
B.
first grey large American
C.
first American grey large
D.
large grey American first
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皮皮学刷刷变学霸
举一反三
【单选题】He mentioned in the letter that he ______ join us once he ______ our invitation.
A.
would come; received
B.
had come; received
C.
was coming; had received
D.
came; received
【简答题】过敏性紫癜最主要的发病机制是（ ）。
【简答题】量程为2~20 uL的移液器,我们实验室配套的枪头是()色的。
【简答题】1909年______成功地设计修建了中国第一条铁路——京张铁路。