苹果nes模拟器:英语选择题

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1.In the past few months the project _____held up by the heated discussion about whether it is worthwhile.
A.is B.was
C.has been D.had been

2.The boy was paid $10 for washing ten windows, most of ____ hadn’t been cleaned for at least a year.
A.those B.these
C.that D.which
烦请说明why,tks!

c in the past few months 是完成时态的标志
d 指代前面的窗

b d