He had to retire(退休) early _____

He had to retire(退休) early ______ poor health.

#58273

as a result

because

because of

推荐题目

Tony is an English boy. He can speak English, ______ he can’t speak Chinese.

#56312

and

but

too

We should protect the earth，         we will have no water to drink．

#58271

and

but

They will not start the work _______ their teacher comes back.

#58093

while

until

as soon as

Milk quickly goes bad in summer        it is in a fridge(冰箱).

#57061

because

unless

when

—Little Kate went to the concert_______it rained heavily yesterday.

#55786

even though

until

unless