31．A．because B．because of C．as D．since——青夏教育精英家教网—

摘要：31．A．because B．because of C．as D．since

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Tom didn’t go hiking with his classmates ____ his illness.

We chose South Hill to have the picnic ________ the beautiful view．

A．because

B．because of

C．as

D．since

They can’t go out the strong wind.

A．because	B．since
C．as	D．because of

She didn’t go to work ___________ her health．

A．because　　

B．because of　　

C．since

D．as

--Why do plants have flowers?

--________ the flowers make seeds.

[　　]

A．Because of

B．Because

C．As

D．Since

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