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【单选题】

Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.

A.
only if
B.
until
C.
so that
D.
even though
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参考答案:
参考解析:
.
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举一反三

【单选题】Books _____ out in this shop.We can _____ now.[ ]

A.
have been sold, get nothing
B.
has been sold, get nothing
C.
has been sold, get some
D.
have been sold, get some