单项选择题

There are so many dresses there that I really don't know ______ to choose.

A．whether
B．when
C．which
D．why
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单项选择题
Though telephone is indispensable in one' s everyday life, it brings a lot of troubles as well.
A．虽然电话在日常生活中是不可缺少的，但它同时也带来了许多麻烦。
B．即使电话在一个人的生活中也不贵，但它带来很多好处的同时也带来了许多麻烦。
C．即使电话在一个人的生活中可有可无，但它会带来很多好处。
D．虽然电话在一个人的生活中不可缺少，但它也会带来一些烦恼。
单项选择题
______, they would certainly come and help us.
A．Had they time
B．Do they have time
C．Had they have time
D．Did they had time
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