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1.1 --Your baby is too thin.

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1.1 --Your baby is too thin.
--It could gain weight,but it ___ much.
A.doesn't eat
B.didn't eat
C.hadn't eat
D.couldn't eat
1.2 It won't be long before such a thing ___ again.
A.will happen
B.happens
C.is happened
D.happend
1.3 He thinks he will be an astronaut ___ thirty.
A.by time of
B.by he is
C.by the time when he will be
D.bu the time he is
1 a 指的是现在的状态
2 b 这个是现在时表将来的用法
从句用一般现在时,主句用一般将来时
if的条件状语从句,也有此用法哦!
3 d 这里省略了when~
也可以说 by the time when he is
a应该为by the time of
b应该为 in his thirties或者when he is
c应该为 by the time when he is be