4． The meeting ______ begin ______ the last man came．

A． didn’t ;until

B． not; until

C． doesn’t; until

D． will; until

[单选题]4． ___________ the day，l went back with my parents．A．In the endB． At the endC． At the end ofD． By the end of

[单选题]4． —This is Mike． Can I _________to Mr Li?—Hold on，please．A．tell'B．talkC．sayD．speak

[单选题]4．—Do you like_______？—No，l don’ t．A．watchsB．breadC．tomatosD．chickens

The Winter Olympic Games will begin _ Feb.4th,2022.A. atB. inC. onD. to

[单选题]4．A．aB．anC．theD．/

[单选题]4．A．HoweverB．AlthoughC．ThatD．Unless

[单选题]4．A．monthB．weekC．dayD．year

m . at Gate 23 .A begin to B begin C claim D beginningTheflightwill_____boarding

,求A^4.

4.设L为椭圆(x^2)/(4)+(y^2)/(3)=1，其周长为a，则oint_(L)(3x^2+4y^2)ds=____.4.设L为椭圆$\frac{x^{