Mr. Smith _____ these days. I think he s_爱下问搜题

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问题选择题

Mr. Smith _____ these days. I think he should take a holiday before he burns out.

A. has been overworking
B. overworked
C. had overworked
D. was overworking

答案

答案：A

填空题

若“!”是一种数学运算符号，并且：1!=1，2!=2×1=2，3!=3×2×1=6，4!=4×3×2×1，…，则

多项选择题

成人普通感冒多数由哪些病毒引起（）

A.鼻病毒

B.副流感病毒

C.柯萨奇病毒

D.呼吸道合胞病毒

E.埃可病毒