【B15】A．whenB．asC．ifD．though

【C11】A．whenB．thatC．ifD．" />

【B15】______A．thatB．whenC．ifD．because

【C8】A．SinceB．AsC．IfD．Though

A．only whenB．soon afterC．even ifD．as if

Doctors won t operate on the patient______absolutely necessary.A．whenB．ifC．unlessD．though

【C8】A．unlessB．sinceC．ifD．though