Supposing I ___ this gift,what would he say?A.accept B.accepted C.should accept D.would accept 选择B.为什么?还有与Supposing一样的用法有哪些.它们都怎么用.好像是虚拟语句.

Supposing I ___ this gift,what would he say?A.accept B.accepted C.should accept D.would accept 选择B.为什么?还有与Supposing一样的用法有哪些.它们都怎么用.好像是虚拟语句.
Supposing I ___ this gift,what would he say?
A.accept B.accepted C.should accept D.would accept
选择B.为什么?还有与Supposing一样的用法有哪些.它们都怎么用.好像是虚拟语句.

Supposing I ___ this gift,what would he say?A.accept B.accepted C.should accept D.would accept 选择B.为什么?还有与Supposing一样的用法有哪些.它们都怎么用.好像是虚拟语句.
Supposing I ___ this gift,what would he say?
此题只能选B.
首先,句子结构理Supposing【=If】 I ___ this gift,what 【would 信息词 he say】?
其次,看关键信息词,用了虚拟语气形式.据此可推知,前面if从句也应该用虚拟语气.
第三,语义判断：
假如/如果我（现在）接受了这个礼物,他会怎么说?
与现在是相反的虚拟语气,if从句用动词过去式,主句用should/would/could/might+动词原形.
suppose,supposing的用法供参考：
21世纪大英汉词典
supposition 假定 ...
supposing…如果…怎么样
if/ in case /supposing假若
suppose = supposing倘若
provided that /suppose that /supposing假如
(Supposing I Have Seve…假如我有七十二变
supposing [sə'pəuziŋ]
vt.
suppose的变形
conj.
假如,假使
suppose [sə'pəuz]
vt.
1.假使,假定：
Supposing he isn't out,how can I do then?
假定他没出去,我该怎么办呢?
Let's first suppose the second defense line has been destroyed.
我们先来假定这第二条防线已被摧毁.
2.[用于祈使句]让：
Suppose we wait until tomorrow.
咱们就等到明天吧.
Suppose I tell you.
我来告诉你吧.
3.猜想,推测：
I suppose he'll come back now.
我想他这会儿该回来了.
You can't suppose whom I met in the street.
你准猜不着我在大街上看见谁啦.
4.认为,以为：
What do you suppose I will do?
你认为我会做什么?
5.意味着；说明(或证明)…的事实(或情况)：
The number of the cars supposes that the city traffic would get busier and busier.
这些汽车的数量意味着该市的交通会越来越拥挤.
That doesn't suppose you were absent at the scene of the crime.
那并不能说明你不在犯罪现场.
6.假定…的存在；需要…的存在为先决条件：
First,we have to suppose that she was out to make money.
首先,我们得假定她抛头露面是为了赚钱.
7.[用于被动语态]认为应该,认为必须；认为…必要；[口语]认为可以：
I'm not supposed to be at the party.
我不该在聚会上露面.
vi.
猜想,料想；认为：
No need to suppose about.
没必要胡乱猜疑.
Say as you suppose.
怎么想的就怎么说.
conj.
1.假使,假如
2.假使…结果如何(或怎样)
变形:
vt.supposed、supposing

还有think，等高中学过，具体的法说不太清楚，有没有英文教师啊，帮帮忙

B. C. D. 都对， supposing后面事虚拟语气，用动词的一般过去时或should／would＋动词。